The train had left, so we could do nothing but ________ another.
| A．wait | B．to wait | C．waited | D．waiting |
Students should be encouraged to use _____ Internet as _____ resource.
| A．不填, a | B．不填, the | C．the, the | D．the, a |
His sister left home in 1998, and_______ ever since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
Sam _____ some knowledge of the computer just by watching others working on it.
| A．brought up | B．looked up | C．picked up | D．set up |
-----Have you been wasting time on computer games again?
----- _______. I’ve been studying a lot and I need a break.
| A．No way | B．Not really |
| C．I don’t agree | D．I couldn’t agree more |
When I got on the bus, I_____ I had left my wallet at home.
| A．was realizing | B．realized |
| C．have realized | D．would realize |