A. therefore

　　B. although

　　C. since

　　D. unless

　　26. ---Look! Somebody ______ the sofa.

　　---Well, it wasn’t me. I didn’t do it.

　　A. is cleaning

　　B. was cleaning C. has cleaned

　　D. had cleaned

　　27. The air quality in the city, ______ is shown in the report, has improved over the past two months.

　　A. that

　　B. it

　　C. as

　　D. what

　　28. The lecture, ______ at 7:00 pm last night, was followed by an observation of the moon with telescopes.

　　A. starting

　　B. being started

　　C. to start

　　D. to be started

　　29. Care of the soul is a gradual process ______ even the small details of life should be considered.

　　A. what

　　B. in what

　　C. which

　　D. in which

　　30. When ______ for his views about his teaching job, Philip said he found it very interesting and rewarding.

　　A. asking

　　B. asked

　　C. having asked

　　D. to be asked

　　31. Not until he retired from teaching three years ago ______ having a holiday abroad.

　　A. he had considered

　　B. had he considered

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