I won’t pass the exam ______I work hard.
| A．whenever | B．because | C．if | D．unless |
--Tom,be careful not to drive to fast._________ .
--Thank you for your advice.
| A．It’s better to be safe than sorry. |
| B．Too many cooks spoil the broth. |
| C．Many hands make light work. |
| D．Every dog has its day. |
We must do everything we can _________ our earth clearer and safer.
| A．made | B．to making | C．make | D．to make |
We all know that paper burns in _________ .
| A．CO2 | B．N2 | C． O2 | D．CO |
This is one of the best films _________ this year.
| A．have been shown |
| B．that have shown |
| C．that have been shown |
| D．which has been shown |
________ our journey by camel was!
| A．What an exciting experience |
| B．What exciting experience |
| C．How excited experience |
| D．What an excited experience |