is known to everybody that the moon travels round the earth once every month.
| A．It | B．As | C．That | D．Which |
Duty is an act or a course of action that people ____ you to take by social customs, law or religion.
| A．persuade | B．request | C．instruct | D．expect |
But for these interruptions, the meeting half an hour ago.
| A．was finished | B．would have finished |
| C．had finished | D．would finish |
_____ by the latest electronic toys, the little boy stood in front of the windows, without moving.
| A．To be arrested | B．Arrested | C．Having arrested | D．Arresting |
It seems that living green is ________ easy and affordable. A small step makes a big difference.
| A．exactly | B．fortunately | C．surprisingly | D．hardly |
A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
| A．which | B．where | C．what | D．why |