Hundreds of people, policemen and civilians included, have got injured as a result of the political _______ in Hong Kong.
| A．conflict | B．reform |
| C．progress | D．demand |
The old man would appreciate _____ if you could do him that favour.
| A．one | B．it | C．that | D．this |
It is reported that this kind of vegetables _ a lot of vitamins C.
A. contains B. includes C. holds D. keeps
______ time went by , Herbert could finish all the maths exercises in class.
| A．With | B．As | C．while | D．Since |
Lots of the scientists in our country are working hard to ____the planet Mars .
| A．cover | B．search | C．discover | D． explore |
Look at the notice . You are not allowed ____ the gymnasium without permission.
| A．to enter | B．enter | C．entering | D．for entering |