He failed the exam ________ he was too careless.
| A．because | B．but |
| C．so that | D．so |
You can’t do _______ before you finish your homework.
| A．something | B．anything |
| C．nothing | D．nobody |
Mr. Lee has worked in a bookshop _______ he left college in 2007.
| A．until | B．while |
| C．since | D．from |
Mike was ill yesterday, _______ he didn’t go to school.
| A．if | B．but | C．so | D．or |
September is the ____ month of a year.
| A．nine | B．ninth |
| C．nineth | D．ninety |