Please remember to _________the electricity and water before you leave the laboratory．（ ）
A．take offB．shut offC．go offD．put off
We are making a big cake ________ it’s Dad’s birthday today.
| A． |
because |
B． |
until |
C． |
once |
It’s important for us ________ hard in order to have a better life.
| A． |
work |
B． |
to work |
C． |
working |
— ________ have you been a member of the Helpers’ Club?
— For two years.
| A． |
How soon |
B． |
How long |
C． |
How often |
—May I ________ your pen? I can’t find mine.
—Sure. Here you are.
| A． |
repair |
B． |
make |
C． |
borrow |
—Betty, you’d better follow the doctor’s ________ and do more exercise.
—I will. Thank you.
| A． |
advice |
B． |
agreement |
C． |
information |