23．A: We are doing well in English.

　B: We are ______ ______ English.

22．A: My house is about twenty minutes by bike.

　B: It ___ me　 about　 twenty　 minutes ______ go to school by bike.

根据各题中A句意思，完成B句，每空一词

21．A: We've been at this school for about two years.

　B: We've been at this school ______ two years ______ .

20. I______ (do) my homework when mother came back from work yesterday.

19．Miss Green (teach) in the school for five years.

18．The teacher asked me (help) Mary with her lessons yesterday afternoon.

17．The headmaster (take) part in a meeting next week.

用括号中所给动词的适当时态填空

16．His brother ______ (join) the army three years ago.

15．give an answer when you don't really know (g______)

14．very happy (m______)