A notice was placed by the river bank warning people to__________ the thin ice.
| A．keep up |
| B．keep back |
| C．keep away |
| D．keep off |
–I wonder how much you charge for your service.
--The first two are free____ the third costs $30.
| A．before | B．as | C．when | D．while |
-What’s wrong with him?
--The picture he came across____ his memory of a sad story in his childhood.
| A．set off | B．took off | C．gave off | D．put off |
You have nothing to___ by refusing to listen to our advice.
| A．catch | B．earn | C．gain | D．grasp |
–The weather is getting warmer. I hope the children won’t go onto the ice.
--I warned them_____.
| A．not to | B．not | C．won’t | D．not go |
–Are you still very busy?
-- Yes, I_____the report for the manager and it won’t take long.
| A．have just finished | B．had just finished |
| C．am just finishing | D．am just going to finish |