In this country it is required that anyone who wants to settle here ______ to pass this kind of test.
| A．has | B．must have | C．have | D．will have |
He must have passed this way, _____here are his footprints.
| A．since | B．because of | C．now that | D．for |
“Why can’t you do it now?” “_____I’m too busy.”
| A．Since | B．As | C．Because | D．For |
_____it is raining, we had better take a taxi.
| A．For | B．As | C．Because of | D．When |
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 |