I'd better not catch ______ that again !
| A．your doing | B．you doing | C．you to do | D．you being doing |
It was_____he was ill that he was absent yesterday.
| A．because | B．as | C．since | D．now that |
_____everybody is here, Let’s set off.
| A．Since | B．Because | C．For | D．After |
I would like to do it_____I like it.
| A．since | B．because | C．because of | D．now that |
If you_____this experiment you will understand the theory better.
| A．will be doing | B．have done | C．will have done | D．would do |
I don’t like to be interrupted if I_____.
| A．speak | B．will speak | C．am speaking | D．spoke |