25. ─Do you mind if I open the window?

─_____________.We should let in more fresh air.

A.Yes,go ahead　　　　　　　　　　 B.I would like to close if

C.Of course not　　　　　　　　　　 D.I’d prefer it if you didn’t

24. ─Whose backpack do you think this is ?

─Look at the tennis bat.Rita is on the tennis team.So it_______be her backpack.

A.must　　　　　　　　　　 C.mustn’t　　　’t

23. The foreigners________visited our school are from Germany.

A.which　　　　　 B.who 　　　　C.when　　　　 D.whom

22. ─ Could you go out for a walk with me now?

　 ─Sorry!I_________my plants yet.Maybe next time.

A．am not watering　　 B.won’t water　 C.haven’t watered　　 D.didn’t water

21. I found ________not very difficult to keep away from then A/H1N1 Flu.

A.that　　　　　　 B.this　 　　　　C.one　　　　　 D.it

20. ─Excuse me ,could you please tell me ________?

─Sure.It’s just on Main Street.　　　　　

A.how many people there are　　　　　　 B.how well you know him

C.where the post office is　　　　　　　 D.when he will be back