3. —I counted sheep, I drank milk and I tried everything, but nothing helped.

　　—It seems you _____ too much recently. Try some sleeping pills.

　　A. worked

　　B. work

　　C. had worked

　　D. have been working

　　4. Livemocha.com is a free site _____ visitors can not just learn languages but also chat online.

　　A. that

　　B. which

　　C. where

　　D. what

　　5. —John is really expert at fighting cybercrime!

　　 —Yes, but he _____ his potential if it had not been for his desire to meet the new challenge.

　　A. never realized

　　B. would never realize

　　C. would never have realized

　　D. had never realized

　　6. —Jimmy had a lot of parties recently.

　　 —Yes, that might _____ why he didn’t do well in the test.

　　A. account for

　　B. push for

　　C. make for

　　D. compensate for

　　7. —How long will it be _____ the professor makes another visit to China?

　　  —It all depends.

　　A. until B. before C. since

　　D. when

　　8. Generally, _____ to a university in the USA, foreign students need to prove their strong ability in using English.

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