21.In such dry weather, the flowers will have to be watered if they _______.

A.have survived B.are to survive

C.would survive D.will survive

22._______ at the door before entering, please.

A.Knocked B.To knock

C.Knocking D.Knock

23. Hundreds of jobs _______ if the factory closes.

A.lose B.will be lost C.are lost D.will lose

24. I've won a holiday for two weeks to Florida.I _______ my mum.

A.am taking B.have taken

C.take D.will have taken

25. A new cinema _______ here.They hope to finish it next month.

A.will be built B.is built

C.has been built D.is being built

26.The new suspension bridge _______ by the end of last month.

A.has been designed B.had been designed

C.was designed D.would be designed

27. _______ blood if you can and many lives will be saved.

A.Giving B.Give

C.Given D.To give

28.-You've left the light on.

-Oh, so I have._______ and turn it off.

A.I'll go B.I've gone

C.I go D.I'm going

29. -How are you today

-Oh, I _______ as ill as I do now for a very long time.

A.didn't feel B.wasn't feeling

C.don't feel D.haven't felt

30. The reporter said that the UFO _______ east to west when he saw it.

A.was traveling B.travelled

C.had been traveling D.was to travel

31. My uncle _______ until he was forty-five.

A.married B.didn't marry

C.was not marrying D.would marry

32.An awful accident _______, however, occur the other day.

A.does B.did

C.has to D.had to

33. Old McDonald gave up smoking for a while, but soon _______ to his old ways.

A.returned B.returns

C.was returning D.had returned

34. —You're drinking too much.

—Only at home.No one _______ me but you.

A.is seeing B.had seen

C.sees D.saw

35. All the preparations for the task _______, and we're ready to start.

A.completed B.complete

C.had been completed D.have been completed

36. _______ some of this juice—perhaps you'll like it.

A.Trying B.Try C.To try D.Have tried

37. The price _______, but I doubt whether it will remain so.

A.went down B.will go down

C.has gone down D.was going down

38. —Hey, look where you are going!

—Oh, I'm terribly sorry._______.

A.I'm not noticing B.I wasn't noticing

C.I haven't noticed D.I don't notice

39.E-mail, as well as telephones, _______ an important part in daily communication.

A.is playing B.have played

C.are playing D.play

40.He _______ to the lab than he set out to do the experiment.

A.has no sooner got B.no sooner got

C.will no sooner get D.had no sooner got