Find ways to praise your children often，__________ you'll find they will open their hearts to you.
| A．till |
| B．or |
| C．and |
| D．but |
---Must I clean the window now?
---No, you ______.
| A．mustn’t | B．needn’t | C．can’t | D．may not |
In order to attract more customers, many supermarkets usually sell their goods at a good ______ at weekends.
| A．discount | B．agreement | C．bargain | D．cost |
---When can I come for the English books? I need them tomorrow afternoon.
---They ______ be ready by half past eleven.
| A．can | B．should | C．might | D．need |
The young man is a person of great perseverance(毅力), from which he ______ a lot.
| A．satisfies | B．gains | C．awards | D．benefits |
---What will you do next Sunday?
---Maybe do some shopping, for I ______ go to school on Sunday.
| A．mustn’t | B．can’t | C．don’t have to | D．had better not |