Since the new prohibition of drunk driving_____, the number of accidents in the area has fallen sharply.
| A．has been introduced | B．introduced |
| C．was introduced | D．has introduced |
parents say and do has a life-long effect on their children.
| A．That | B．Which | C．What | D．As |
Choosing the right dictionary depends on ______ you want to use it for.
| A．what | B．why | C．how | D．Whether |
It is none of your business ___ ___ other people think about you. Believe yourself.
| A．how | B．what | C．which | D．when |
Why not try your luck downtown, Bob? That’s ______ the best jobs are.
| A．what | B．where | C．when | D．why |
You can only be sure of_________ you have at present; you cannot be sure of something _____ you might get in the future.
| A．that; what | B．what; / | C．which; that | D．/; that |