B. constantly

C. continuously

D. consistently

6. The carbon content of steel largely determines its usefulness for ________ applications.

A. specific

B. tough

C. fantastic

D. typical

7. Her bravery has given him the will to ______ with his life and his work.

A. come up

B. put up

C. keep contact

D. carry on

8. He ______ in a youth hostel for two months when he was in London.

A. has stayed

B. stayed

C. had stayed

D. had been staying

9.And years later, she was proud that her son had read thousands of books, was awarded a PhD

in literature, and________ his own books, articles, poetry and fiction.

A. bid

B. recited

C. authored

D.spotted

10. — How ______ yobe so stupid as to believe him?

— Sorry, I did go out of my head somehow.

A. could

B. need

C.must

D. might

11. A number of major problems remain ______ about this new research project.

A. solving

B. to be solved

C. solved

D. to solve

12. I would like to particularly thank Professor Fisher, without whose instructions I ______ such a large English vocabulary.

A. didn’t acquire

B. wouldn’t acquire

C. hadn’t acquired

D. wouldn’t have acquired