You _____ such a serious mistake if you had followed his advice.
| A．may not make | B．might not make |
| C．shouldn’t have made | D．might not have made |
To learn English well, we should find opportunities to hear English_______ as much as we can.
| A．speak | B．speaking | C．spoken | D．to speak |
---You effort is sure to pay __________
---Thank you for you encouragement.
| A．off | B．back | C． for | D．down |
Although he failed when he tried doing the experiment for the first time, he decided to try it____.
| A．once in a while | B．at once | C．once more | D．once |
–Is there something I can do now? -Yes.______ the meat for cooking meat ball.
| A．Cut in | B．Cut out | C．Cut up | D．Cut through |
I tried phoning Maggie’s office in the morning, but I couldn’t _____ .
| A．go over | B．get through | C．put up | D．join up |