The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
| A．after | B．before | C．since | D．when |
Mary couldn't remember when she first met Mr Anderson, but she was sure it was _____ Sunday. because everybody was at _____ church.
| A．/；the | B．the; / |
| C．a; / | D．/;a |
The students running on the playground are all in their uniforms, so it's hard for you to _____ my sister in them.
| A．take up | B．take out |
| C．pick up | D．pick out |
—You were brave enough to shout at the meeting.
—Well, now I regret _____ that.
| A．to do | B．to be doing |
| C．to have done | D．having done |
The general has been invested _____ full power.
| A．for | B．at |
| C．to | D．with |
The police have asked for witnesses of the accident to _____ to offer some help.
| A．step across | B．step forward |
| C．step up | D．step down |