21. John was _______ he lay down for an hour before dinner.

　　A. so tired as B. so tired that C. too tired that D. too tired so

　　22. Your answer is different ________ the teacher’s.

　　A. to B. at C. from D. with

　　23. It would be _______ a risk to leave the baby alone.

　　A. running B. passing C. carrying D. obeying

　　24. The fact _______ his health is bad is not true.

　　A. which B. that C. as D. what

　　25. These ______ did unusually well in the contest, so the judges didn’t know whom to give prize to.

　　A. woman singers B. women singers C. women singer D. womans singers

　　26. Man must stop _______ the earth’s atmosphere.

　　A. filling B. wasting C. polluting D. blackening

　　27. We can’t _______ another 100 kilometers any more.

　　A. have B. turn C. make D. reach

　　28. Is Mary ______ to join in us?

　　A. supposed B. exposed C. supported D. indicated

　　29. I want to be told all _______.

　　A. which happen B. which happened

　　C. that had happened D. that had been happened

　　30. We’ve all heard of Thomas Edison, _______ who invented the electric light and many other things.

　　A. man B. a man C. the man D. men

　　31. Don’t tell me such things _______ you are not certain.

　　A. that B. which C. those D. as

　　32. _______ a microscope we can see different kinds of things that are unable to be seen by our naked eyes.

　　A. In terms of B. In place of C. By means of D. By far

　　33. Jackson went to work ______ his illness.

　　A. besides B. even though C. in spite of D. although

　　34. Anybody will do, _______ he is responsible for that.

　　A. as far as B. so far as C. as long as D. as soon as

　　35. I suppose they have known about it, _______?

　　A. am I B. am not I C. have they D. haven’t they

　　36. It ______ him ten years to write that novel.

　　A. took B. spent C. cost D. costed

　　37. The students are looking forward to _______ their holidays in Japan.

　　A. spend B. spending C. for spend D. spent

　　38. They all ______ mentioning that girl.

　　A. avoided B. got away C. ran away D. escaped

　　39. Human beings should find a new _______ of energy.

　　A. orient B. source C. origin D. souse

　　40. The couch is comfortable to _______.

　　A. sit B. be sat C. sitted D. sit on