To prevent driving too long a time，we________ driving on the highway.
| A．took turns |
| B．took turn |
| C．made turns |
| D．made turn |
For all these years I have been working for others. I’m hoping I’ll _________ my own business some day.
| A．turn up | B．fix up |
| C．set up | D．make up |
Some of you may have finished Unit one. _________, you can go on with Unit two.
| A．If you may | B．If so |
| C．If not | D．If you do |
At the end of the eighteenth century, masks _________ completely.
| A．ban | B．had banned |
| C．banned | D．were banned |
We live in an age _________ more information is available with greater ease than ever before.
| A．why | B．on which |
| C．to whom | D．when |
Before he volunteered to direct traffic, Timoteo _________ lots of jobs.
| A．had had | B．has |
| C．have had | D．had |