27．We should finish the important job, ________.

　A. long it takes however

　B. it takes however long

　C. long however it takes

　D. however long it takes

26．The new secretary is supposed to report to the manager as soon as she ________.

　A. will arrive　　　　　　　　　　　　　　　　　　　 B. is going to arrive

　C. arrives　　　　　　　　　　　　　　　　　　　　　　　　 D. is arriving

25．Although he is considered a great writer, ________.

　A. however his works are not widely read

　B. but his works are not widely read

　C. his works are not widely read

　D. still his works are not widely read

24．________ you talk to someone or write a message, you show your skills to others.

　A. At times　　　　　　　　　　　　　　　　　　　　 B. Some time

　C. By the time　　　　　　　　　　　　　　　　　　 D. Every time

23．The volleyball match will be put off if it ________.

　A. will rain　　　　　　　　　　　　　　　　　　　　 B. rains

　C. rained　　　　　　　　　　　　　　　　　　　　　 D. is raining

22．I hurried ________ I wouldn’t be late for class.

　A. since　　　　　　　　　　　　　　　　　　　　　　 B. so that

　C. as if　　　　　　　　　　　　　　　　　　　　　　　 D. unless

21．They went on working ________ it was late at night.

　A. even if　　　　　　　　　　　　　　　　　　　　　　　　 B. as if

　C. however　　　　　　　　　　　　　　　　　　　　 D. as though

20．If you ________ this experiment, you will understand the theory better.

　A. will be doing　　　　　　　　　　　　　　　　　 B. have done

　C. will have done　　　　　　　　　　　　　　　　 D. would do

19．The problem won’t be settled until we ________ a chance to discuss it thoroughly.

　A. have had　　　　　　　　　　　　　　　　　　　 B. will have

　C. will have had　　　　　　　　　　　　　　　　 D. would have

18．I’ll be back before you ________.

　A. will leave　　　　　　　　　　　　　　　　　　　 B. will have left

　C. leave　　　　　　　　　　　　　　　　　　　　　　 D. would leave