A clear, warm day suddenly grew chill ________ a dark curtain of rolling dust advanced across the plains.

A. until    B. as       C. so       D. since

Some companies have introduced flexible working time with less emphasis on pressure ________.

A. than more on efficiency                                      B. and more efficiency

C. and more on efficiency                                        D. than efficiency

In Martin Luther King’s time, the money spent in educating a black child was just one fourth of ________ on each white child.

A. that spent                      B. what has been          C. it had been                   D. that was spent

William Beebe, one of the first men ________ the depth of the sea in a bathysphere, got interested in oceanography because of one book.

A. exploring                   B. having exploring          C. to be exploring            D. to explore

________ the whole passage, so that you will get a general idea of it.

A. Scanning   B. To scan     C. Scan   D. Having scanned

—Why on earth didn’t you answer the phone?

—I’m sorry, but the doorbell __________ too.

A. is ringing                      B. was ringing             C. rang                        D. was about to ring

—No wonder you caught a cold. You ________ out last night without a coat.

—I know how silly I was.

A. shouldn’t have gone                             B. mustn’t have gone

C. couldn’t have gone                             D. mightn’t have gone

Good advertisements may well ________ the consumers’ emotional needs as well as providing information.

A. refer to      B. see to       C. turn to       D. lead to

Little ________ that his shoes could be sold for 150,000 yuan at the auction (拍卖).

A. Liu Xiang expected                                          B. Liu Xiang had expected

C. did Liu Xiang expect                                      D. had Liu Xiang expected

________ in her life Jennie gained a clear idea of how large the world is.

A. The first time                              B. For the first time

C. At first                                          D. At the first time