By the time I locked the door，I realized I________my keys at home．
| A．had repaired |
| B．had changed |
| C．had forgotten |
| D．had left |
If you feel ______,you should listen to some light music to relax yourself.
| A．cold | B．excited | C．stressed out | D．difficult |
Where is he going ______ vacation?
| A．at | B．for | C．in | D．to |
_____ very important to have good eating habits.
| A．That’s | B．It’s | C．He’s | D．This is |
Are they getting ready _____ the exam?
| A．for | B．to | C．at | D．in |
Listen! Someone ______ in the next room.
| A．sing | B．singing | C．is singing | D．are singing |