studying abroad can be hard, it can broaden your understanding of the word.
| A．If | B．While | C．Because | D．Since |
-– I wonder how much you charge for your services.
--- The first two are free the third costs $30.
| A．while | B．until | C．when | D．before |
We can never expect bluer sky unless we create less polluted world.
| A．a; a | B．a; the |
C．the; a | D．the; the |
A good friend of mine from I was born showed up at my home right before I left for Beijing．
| A．how | B．whom | C．when | D．which |
The play next month aims mainly to reflect the local culture．(C)
A．producedB．being produced C．to be produced D．having been produced
Some people who don’t like to talk much are not necessarily shy；they just be quiet people．
| A．must | B．may | C．should | D．would |