21.— We are too busy to take ________ holiday at ________ present.
— But I think we’ll be able to take ________ two weeks from now.
A. a ; / ; one B. the ; / ; that C. a ; the ; it D a; / ; it
22. “I’m certainly more and more to the conclusion that Iraq has, ___they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Bill said.
A. which, what B. as, which C. as, that D. as, what
23. They ______ a small laboratory and devoted every spare moment to this work.
A. picked up B. put up C. set up D. grew up
