30.（单选题）Students don’t change classrooms between periods-instead, the teachers move to different classrooms.

22.（单选题）You ______ to be here an hour ago!

21.（单选题）Too rich a ______ is not good for all of us.

20.（单选题）We encourage ______ to complain about faulty foods.

19.（单选题）They usually have less money at the end of the month than ______ at the beginning.

18.（单选题）I like wines with adelicate ______.

17.（单选题）This is a new product that______ to absorb moisture.

16.（单选题）The cost has______ equally between the three of them.

15.（单选题）The young man is ______in experience.

14.（单选题）– Are you still thinking about yesterday’s game?– Oh, that’s______ .

13.（单选题）He often asked me the question______ the answer was wrong.