─Do you know second-hand smoke?
─To prevent our health and memory.
| A．how we should prevent |
| B．where should we prevent |
| C．why we should prevent |
| D．whether we should prevent |
______we take exercise, _____ we will be.
| A．Much; healthy |
| B．The more; the healthy |
| C．The more; the healthier |
| D．More; the healthier |
-Must I finish all the homework this evening?
-No, you __________. Tomorrow is Saturday, and you have enough time for it.
| A．mustn’t | B．needn’t | C．won’t | D．can’t |
We teenagers shouldn’t just ________ our looks．We should develop our abilities．
| A．pay attention to | B．look forward to |
| C．end up | D．lay out |
Now most families have only one child _____ our country’s one-child policy.
| A．so | B．because | C．because for | D．because of |
On ________ , American children often give flowers and cards to their mothers to thank them．
| A．Father’s Day | B．Teachers’ Day |
| C．Mother’s Day | D．National Day |