He made an attempt to________the misunderstanding about the origin of the language.
| A．clarify |
| B．check |
| C．claim |
| D．clap |
— Remember the first time we met, Jim?
— Of course I do. You _______ in the library.
| A．were reading | B．had read | C．have read | D．read |
I always prefer _______ a bike rather than _______ to work.
| A．riding, drive | B．to ride, drive |
| C．ride, driving | D．to ride, driving |
When you read the book, you’d better make a mark _____ you have any questions.
| A．at which | B．at where | C．the place | D．where |
AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.
| A．that it is | B．to be | C．that it has been | D．to have been |
________ the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.
| A．As | B．When | C．With | D．If |