—Have you known Dr. Jackson for a long time?

—Yes, since she________ the Chinese Society.

A. has joined          B. joins                         C. had joined                 D. joined

 The wet weather will continue tomorrow when a cold front ______ to arrive.

A. is expected           B. is expecting     C. expects    D. will be expected

 If the weather had been better, we could have had a picnic. But it ____ all day.

A. rained                           B. rains                     C. has rained       D. is raining

 If their marketing plans succeed, they ____ their sales by 20 percent.

A. will increase       B. have been increasing          C. have increased    D. would be increasing

 By the time he realizes he ____into a trap, it’ll be too late for him to do anything about it.

A. walks     B. walked     C. has walked    D. had walked

 Though we don’t know what was discussed, yet we can feel the topic_____.

A. had changed        B. will change      C. was changed   D. has been changed

 In recent years many football clubs ______ as business to make a profit.

A. have run                  B. have been run           C had been run             D. will run

 In recent years many football clubs ______ as business to make a profit.

A. have run                  B. have been run           C had been run             D. will run

 The telephone _______, but by the time I got indoors, it stopped.

A. had rung                B. was ringing                 C. rings                   D. has rung

 I don’t believe you’ve already finished reading the book — I ______it to you this morning!

A. would lend   B. was lending    C. had lent     D. lent