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20. ________ I cannot understand is ________ she wants to resign her present job.

A. What; why            B. Which; how    C. That; why       D.What; because

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19. ________ the website of the Fire department in your city, and you will learn a lot about firefighting.

A. Having searched   B. To search        C. Searching         D. Search

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18. He appears to be optimistic, but, ________, he is quite pessimistic.

A. in other words           B. on one hand     C. for one thing      D. as a matter of fact

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17. ________ you may have, you should gather your courage to face the challenge.

A. However a serious problem         B. What a serious problem

C. However serious a problem         D. What serious a problem

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16. It is a problem that there are not enough jobs ________ for university graduates every year..

A. present        B. available       C. precious               D. convenient

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