---- ________do you go on school trips ?
---- Once a month.
| A．How often | B．How long |
| C．How much | D．When |
They are __________.
A. boys B. boy C. boy’s
You can never imagine the great difficulty I had ___________ her QQ number.
A. to get B. getting C. got
If you do all these other things instead of your homework, you _______ time to study.
A. didn’t have B. don’t have C. won’t have
He asks ________ we can help protect the environment.
A. how B. what C. that
People in this area ________ to leave because there is not enough water for them.
A. told B. was told C. were told