Bob， dinner is ready． Please wash your hands ________ you eat．（ ）
| A． |
until |
B． |
after |
C． |
while |
D． |
before |
Our teachers don't allow us ______ mobile phones in the school.
| A． |
to use |
| B． |
use |
| C． |
using |
- How clean the roads are!
- They ______ by the hard﹣working cleaners every day.
| A． |
are cleaned |
| B． |
clean |
| C． |
will clean |
- Jack，how do you like the new movie Hi，Mom!directed（导演） by Jia Ling？
- Well，it's really a funny movie.I ______ it for three times.
| A． |
am watching |
| B． |
will watch |
| C． |
have watched |
My father always tells me never to ______ when I am in trouble.
| A． |
give up |
| B． |
put on |
| C． |
help out |
- Hey，Clark.Would you like to have a picnic with us this weekend？
- Sorry，I'll have an exam next Monday，so I ______ prepare for it.
| A． |
can |
| B． |
may |
| C． |
must |