________ I cannot understand is ________ she wants to resign her present job.
A. What; why B. Which; how C. That; why D.What; because
________ 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
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
________ 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
It is a problem that there are not enough jobs ________ for university graduates every year..
A. present B. available C. precious D. convenient
In recent years, many environmental protection firms ________ to make a profit.
A. have run B. had been run C. have been run D. will run
