16.There is______ ruler，__B__ eraser and some pens in my pencil­box.(2014，合肥模拟)

　　A.an;a B.a;an C.a;the D.the;/

　　17.—Do you know Ye Shiwen?(2014，玉林)

　　—Yes，she is______ Olympic swimming star.She started swimming at__D__ age of six.

　　A.an;an B.a;the C.the;an D.an;the

　　18.—How did you know______ news about Greenpeace，Lisa?(2014，绵阳)

　　—Well，I got it from__B__ China Daily.

　　A.a;the B.the;/ C.the;the D.an;a

　　19.______ Yangtze River is__A__ first longest river in China.(2014，宣城模拟)

　　A.The;the B.A;the C.A;a D.The;a

　　20.One afternoon he found a handbag.There was ________ “s” in one corner of__C__ handbag.

　　A.an;a B.a;the C.an;the D.a;a

　　21.I think it's really__D__ hard work for me to finish the job in twenty minutes.

　　A.a B.an C.the D.不填

　　22.I will take ______vacation with my parents __C__day after tomorrow.(2014，铜陵模拟)

　　A.a;/ B.an;a C.a;the D.the;a

　　23.—Have you seen______ iPhone 5S?I left it here this morning.

　　—Is it __B__ black one?I think I saw it somewhere.

　　A.an;the B.an;a C.the;a D.the;/

　　24.When you finish reading the book，you will have ________ better understanding of__D__ life.

　　A.a;the B.the;a C./;the D.a;/

　　25.—Do you know Robert?(2014，马鞍山模拟)

　　—Yes，he is______ university student.He likes sports and runs for__B__ hour every morning.

　　A.a;a B.a;an C.an;an D.an;a