21.He climbed up into the tree and picked all the fruit __________ reach.

　　A. by

　　B. out of

　　C. at

　　D. within

　　22. Would you please step __________ and have a cup of coffee with us?

　　A. aside

　　B. in

　　C. back

　　D. on

　　23. __________ this medicine regularly; it will protect you against a return of the illness.

　　A. Take

　　B. Taking

　　C. To take

　　D. Taken

　　24.__________ the contract provides otherwise, it is the buyer’s legal duty to collect the goods from the seller’s premises.

　　A. Although

　　B. Unless

　　C. Provided

　　D. Considering

　　25. I don’t believe him; he __________ be serious.

　　A. can’t

　　B. needn’t

　　C. mayn’t

　　D. mustn’t

　　26. __________ past performances, he is not likely to do well in his exams.

　　A. Judged from

　　B. To judge from

　　C. Judge from

　　D. Judging from

　　27. He is a criminal from justice trying to avoid __________ by the police.

　　A. having been caught

　　B. being caught

　　C. catching

　　D. to be caught

　　28. During the meeting, __________ begun to speak when the audience interrupted him.

　　A. hardly he had

　　B. hardly had he

　　C. no sooner had he

　　D. no sooner he had

　　29.Water is water __________ it is still or in waves.

　　A. if

　　B. which

　　C. whether

　　D. what

　　30.__________ children, the importance of games should not be ignored in the life of adults.

　　A. With

　　B. Regarding

　　C. For

　　D. As with