Doctors say that exercise is important for health, but it ________ be regular exercise.
| A．can | B．will |
| C．must | D．may |
They are broadening the bridge to ____ the flow of traffic．
| A．put off | B．speed up | C．turn on | D．work out |
The two girls are so alike that strangers find ___ difficult to tell one from the other．
| A．it | B．them | C．her | D．that |
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 |
---I’m sorry I broke the vase．
---0h．______．It wasn’t very expensive．
| A．you’d better not | B．I’m afraid not |
| C．as you wish | D．that’s all right |
Take your time—it’s just ______ short distance from here to ___ restaurant．
| A．不填；the | B．a；the | C．the；a | D．不填；a |