When he came back from abroad, Joan told us about the cities and the people ______ he had visited.
| A．that | B．who | C．where | D．which |
Plastic and rubber won't _________ electricity,but copper will.
| A．have | B．do | C．pass | D．conduct |
____no need for us to discuss the problem again since it has already been solved.
| A．It has | B．There has | C．We have | D．There is |
I didn't like aunt Lucy,who __________ without warning and bringing us presents.
| A．always turned up | B．has always turned up |
| C．had always turned up | D．was always turning up |
You'd better get all the work _________ before you leave.
| A．finishing | B．to finish | C．finished | D．be finished |
At midnight the enemy attacked _________.
| A．without warning | B．without notice | C．without permission | D．A or B |