. I have taught hundreds of students,___________ having been working in their fields for years.
| A．some of whom | B．some of them | C．most of whom | D．who |
— Mr. Smith was really helpful when you were in financial difficulty during those years.
— Definitely. I can never appreciate his kindness _____.
| A．seriously | B．well | C．enough | D．properly |
People hope to become more _____ in predicting earthquakes.
| A．absolute | B．steady | C．perfect | D．accurate |
We had a really bad time about six months ago but now things are _____.
| A．picking up | B．coming up | C．making up | D．turning up |
— What's the matter with you, Lucy?
— After the long walk, my legs _____ and I couldn't go any farther.
| A．gave off | B．gave in | C．gave up | D．gave out |
The task _____ more difficult than we expect.
| A．proved to | B．proved us | C．was proved | D．proved |