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