—I’ve told Nancy many times about the meeting, but she still forget it!
—I understand. Actually, anyone ______ be very forgetful at times.
| A．must | B．should | C．ought to | D．can |
You cannot take back your words _________ they are out of your mouth.
| A．before | B．whether | C．once | D．while |
—What’s that noise?
—There’s a truck stopping outside. It’s someone _____ something.
| A．deliver | B．to deliver | C．delivering | D．delivered |
Remember me to your parents when you _____ them.
| A．are calling | B．call | C．will call | D．have called |
_____ time, the teacher had us do half of the exercises in class and complete the other half for our homework.
| A．To save | B．Save | C．Saving | D．Having saved |
When _____ about one of the biggest concerns today, many citizens mentioned the sharp rise in housing price.
| A．asking | B．to ask | C．asked | D．having asked |