—Must I return this magazine within one week?
—No, you ________.
| A．didn’t have to |
| B．mustn’t |
| C．hadn’t better |
| D．shouldn’t |
The old man used __________ in front of his house and he has got used to __________ like that.
| A．to sit; doing | B．to sitting; do |
| C．to sit; do | D．to sitting; doing |
I found the homework was not so heavy as __________ I __________ to get in my old school.
| A．that; was used | B．what; used |
| C．which; used | D．that; used |
—May I ask a question after class, Sir?
— __________, but not during my lunch break.
| A．I am sorry | B．Anytime |
| C．Go ahead | D．Certainly |
Many people have fully realized it's important to keep __________ balance of __________ nature. Otherwise, humans will be punished by it.
| A．a; the | B．the; the |
| C．the; / | D．/; / |
He lost his __________ and fell off his bicycle.
| A．balance | B．strength |
| C．power | D．way |