—Have you been to the Great Wall?
—Perhaps not in my memory; ____, it might have been during the early childhood.
| A．if any | B．if so |
| C．if ever | D．if not |
This film is boring; it is, in fact, rather exciting and fascinating．
| A．all but | B．nothing but |
| C．no more | D．anything but |
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 |
—Do you mind if I use your reference book?
—No, ______.
| A．look out | B．forget it |
| C．be my guest | D．take it easy |