He looked around and caught a man ______ his hand into the pocket of a passenger.
| A．put | B．to be putting |
| C．to put | D．putting |
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 |
Don’t leave her_____ outside in the rain.
| A．wait | B．having waited |
| C．being waited | D．waiting |