16.Jackie, you ________ hang all your clothes in the room like this!

　　A.wouldn't B.needn't

　　C.mustn't D.oughtn't

　　[解析]mustn't 表示禁止，意为“千万不要”。

　　[答案]C

　　17.Holiday shopping ________ be a tiring experience. There are so many places to visit and choices to make.

　　A. can B. may

　　C. shall D. will

　　[解析]句意：假期购物可能是一段累人的经历。有许多地方要看，许多选择要做。can“可能”，语气较肯定;may“或许”，语气较弱;由语境可知，A项正确。

　　[答案]A

　　18.—Listen ! There is a knock on the door. Who ________ it be?

　　—It must be Jack. Just now I sent for him.

　　A. shall B. can

　　C. must D. might

　　[解析]句意：听!有敲门声。会是谁呢?—肯定是杰克。刚才我派人去请他了。can 表推测时，往往用于疑问句和否定句;must 表推测时，只用于肯定的陈述句;might“或许”，语气较弱;由语境可知，B项正确。

　　[答案]B

　　19.Hiking trips ________ sound exciting to most kids, but few realize they ________ be uncomfortable and even dangerous.

　　A. may; can B. must; should

　　C. would; should D. can; will

　　[解析]句意：远足旅行对大多数孩子来说或许听起来很令人兴奋，但很少有孩子意识到这些旅行可能会不舒服，甚至是危险的。由语境可知，两个空都表推测，指客观上的可能性，故A项正确。can“可能”;may“或许”，可能性较 can 弱。

　　[答案]A

　　20.—Where will you start your work after graduation?

　　—Mmm, it's not been decided yet. I ________ continue my study for a higher degree.

　　A. need B. must

　　C. would D. might

　　[解析]句意：—你毕业后到哪里开始工作?—还没决定呢。我可能会继续我的学业，拿一个高一点的学位。need“需要”，作情态动词用时只用于否定和疑问句中;must 表示肯定的推测;would“会;过去常常”;might“或许”;由前置语境 it's not decided yet 可知，应选 might。

　　[答案]D

　　21. Sally looks very happy. She ________ have got the first place in the 200­metre race.

　　A. should B. could

　　C. must D. might

　　[解析]本题考查“情态动词+have done”。句意：Sally 看上去很高兴。她200米赛跑肯定得第一名了。should have done，“本应该干而事实上没干”;could have done 有两层含义：一表示过去可能干过;二表示过去本能够干某事(而事实上没干);must have done“过去肯定干过”;might have done 亦有两层含义：一表示过去或许干过;二表示过去本可以干某事(而事实上没干);由语境可知C项正确。

　　[答案]C

　　22.—Show me your permit, please.

　　—Oh, it's not in my pocket. It ________.

　　A. might fall out B. could fall out

　　C. should have fallen out D. must have fallen out

　　[解析]句意：—请出示许可证。—噢，不在我口袋里。肯定是掉出来了。由语境可知，fall out 动作应发生在过去，因为现在许可证不在口袋里，故应用“情态动词+have done”，排除A、B两项;should have done“本应该干某事(而事实上没干)”，不符合句意;故正确答案为D项，指“过去肯定干过”。

　　[答案]D

　　23.—Tom hasn't turned up yet. He might have got lost.

　　—No, he ________. His car has got a GPS.

　　A. must not have got lost B. wouldn't have got lost

　　C. can't have got lost D. shouldn't have got lost

　　[解析]本题考查 “情态动词+have done”。句意：—汤姆还没到这。他可能迷路了。—不，他不可能迷路。因为他的车上装有GPS定位系统。must 表推测时只用于肯定的陈述句，故A项予以排除;wouldn't have done“不会……”，只用于虚拟语气;can't have done“过去不可能干过”;shouldn't have done“本不应该干某事而事实上已经干了”;由句意可知C项正确。

　　[答案]C

　　24.—Where is Bob? I cannot find him anywhere.

　　—He ________ have been off long. I heard him make a call just now.

　　A. shouldn't B. can't

　　C. mustn't D. needn't

　　[解析]本题考查“情态动词+have done”。句意：—鲍勃哪里去了?我到处找不到他。—他不可能离开久了。我刚才还听见他打电话了。shouldn't have done“本不应该干某事(而事实上已干了)”;can't have done“不可能干过”;must 表推测不能用于否定句，故C项错误;needn't have done“本没有必要干某事(而事实上已干了)”;由语境可知B项正确。

　　[答案]B

　　25.He ________ a big fortune, but he was too lazy to seize the opportunity.

　　A. can have made B. could have made

　　C. must have made D. ought have made

　　[解析]本题考查“情态动词+have done”。can have done“过去可能干过”，一般不用于肯定的陈述句。could have done 意义有二：一表示“过去可能干过”;二表示“过去本能够干某事而事实上没干”;must have done“过去肯定干过”;D项表述错误，应为 ought to have done表示“本应该干某事而事实上没干”;由句意“他本来能够挣大钱，但他太懒没抓住机会”可知B项正确。

　　[答案]B

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　　26.—Do you still remember the day when we went to the Great Wall?

　　—I can't remember it well, but ________ it have been sometime last year?

　　A. would B. must

　　C. could D. should

　　[解析]本题考查“情态动词+have done”。句意：—你还记得我们去长城的那一天吗?—我记不太清了，是不是去年的某个时候?由语境可知，这是对过去某个时间的推测，并且用于疑问句，故只能选 could。

　　[答案]C

　　27.What a pity! Considering his intelligence and diligence, he ________ a higher grade.

　　A. can have achieved B. must have achieved

　　C. need have achieved D. might have achieved

　　[解析]本题考查“情态动词+have done”。can have done“过去可能干过”，一般不用于肯定的陈述句;must have done，“过去肯定干过”;might have done 意义有两层：一表示“过去可能干过某事”;二表示“过去本可能干某事而事实上没干”;由句意“真遗憾!鉴于他的智力和努力，他本来能够获得一个更高一点的分数”可知D项正确。

　　[答案]D

　　28.—Where is my dictionary? I remember I put it here yesterday.

　　—Perhaps, you ________ it in the wrong place.

　　A. must have put B. should have put

　　C. can have put D. might have put

　　[解析]本题考查情态动词。must have done 表示对过去行为的推测，具有较大的可能性，意为“一定……;想必……”;should have done 表示应该做的事情没有做;can have done 表示过去可能做过。might have done 常用于推测过去的行为，表示“可能已经”;还可以表示过去应该做而没有做的事。由句意：“—我的词典呢?我记得我昨天放这儿了。—或许你放错了地方”可知D项正确。

　　[答案]D

　　29.—Sorry, the tickets have already been sold out.

　　—Really? Maybe I ________ a little earlier.

　　A. should come B. should have come

　　C. could have come D. must have come

　　[解析]本题考查“情态动词+have done”。句意：—抱歉，票早已卖完。—真的吗?或许我该早一点来。由语境可知，come 动作发生在过去，应用“情态动词+have done”，排除A项;should have done“本应该干某事而事实上没干”，符合语境;could have done“本能够干而实际上没干”;must have done“过去肯定干过”，均不合语境。

　　[答案]B

　　30.—No wonder you caught a cold. You ________ out last night without a coat.

　　—I know how silly I was.

　　A. shouldn't have gone B. mustn't have gone

　　C. couldn't have gone D. mightn't have gone

　　[解析]本题考查“情态动词+have done”。A项意为“本不应该干某事而事实上已干了”;B项表述错误，must 表推测时只用于肯定的陈述句;C项意为“过去不可能干过”;D项意为“过去或许没干”;句意：—难怪你感冒了。你昨天晚上不应该没穿外套就出去。—我知道我有多愚蠢。故可知A项正确。

　　[答案]A