18. I think Bob should cut his hair.(改为否定句）
I       think Bob      cut his hair.

17. I will ask someone to water my flowers.(改为同义句)
I will      my flowers________  .

16. They allow us to go to the concert tonight.(改为同义句)

We               to go to the concert tonight.

(   ) 15. Dirty water should't be poured into rivers.

―________ . It will cause pollution.

A. I agree with you    B. Never mind

C. I disagree           D. That's right

(   ) 14. The students should't      to take mobile phones.

A. allows    B. allowed C. be allowed    D. allow

(   ) 13. Please stop      ！ It in the cinema.

A. smoking;isn't allowed B. smoking;allows

C. to smoke;isn't allowed D. to smoke;doesn't allow

(   ) 12. He was very ill, but now he is out of danger.(同义替换)

A. dangerous    B. safe

C. safely    D. in danger

(   ) 11. Mrs. Green is a doctor of       and her daughter Ann is       uni-

versity student.

A.  50 years old;an 18-year-old

B.  50-year-old;an 18 years old

C.  50-years-old;a 18 year old

D.  50 years old;a 18 year old

10. She was very excited about      (win) the first prize.

9. The boy is not serious enough      (drive).