Don't press the red button ,_______you will set off the alarm.
| A．but | B．or | C．so | D．and |
What wonderful world it would be if all countries in the world could live peace with one another.
| A．a; \ | B．the; \ | C．a; the | D．the; the |
Ournew machines are much cheaper to run.
| A．effective | B．efficient | C．energetic | D．enthusiastic |
______ today, he would get there by Friday.
| A．Were he to leave | B．If he had left | C．Did he to leave | D．Had he left |
— Pay you weekly or monthly?
— . Either is OK.
| A．Thank goodness | B．Let’s get going | C．It’s up to you | D．That’s all right |
by the thunder, the little girl dare not sleep in her bedroom.
| A．Frightened | B．Frightening | C．Having frightened | D．Being frightened |