They must have finished the work by the end of last month, ______?
| A．hadn’t they | B．mustn’t they | C．haven’t they | D．didn’t they |
Mr. White promised to help me and _______ the next day.
| A．neither he did | B．so he did |
| C．neither did he | D．so did he |
There is plenty of rain in the southeast, there is little in the northwest.
| A．because | B．therefore |
| C．while | D．as |
Don't leave the waterwhile you brush your teeth.
| A．run | B．running |
| C．being run | D．to run |
Wearrive at six. But I'm sorry we are late.
| A．should | B．were supposed to |
| C．must | D．ought to |
Onlyto use this reading room. Students have another room on the second floor.
| A．are the teachers allowed | B．are allowed the teachers |
| C．the teachers are allowed | D．the teachers allowed |