31. The enemy troop suddenly took the small village by surprise _____ a rainy morning.

A. on B. at C. in D. during

30.--What is the model plane look like? --Well, the wings of the plane are _____ of its body.

A. more than the length twice B. twice more than the length

C. more than twice the length D. more twice than the length

29. Is this research center _____ the foreign guests visited last week?

A. that B. which C. where D. the one

28. They started early that morning in order that they_____ there before noon.

A. would get B. got C. must get D. might get

27. Our kind teacher wanted to teach us _____ he knew athis lesson.

A. that B. all what C. that all D. everything which

26. Mary cares about clothes too much, and she _____ too much money _____ clothes.

A. spend; in B.cost; at C. pays; to D. spends; on

25. --How did you do in the test?

--Not so well. I _____ much better but I misread the directions for Part D.

A. could do B. could have done C. must have done D. should do

24. "_____ of them are not here." means "_____ of them are not here."

A. All; Some B. Both; Every C. Both; Neither D. All; Both

23. We must do something to _____ factories _____waste water into the river before it is cleaned.

A. stop; pouring . B. prevent; to pour C. keep; pouring D. stop; to pour

22. What way are you thinking of _____ rid of the flies?

A. to get B. getting C. being got D. to be getting