________there is no law stating how you may dress，not all fashions are respectable.
| A．Because | B．Since |
| C．While | D．Unless |
certainty
| A．instruct | B．case |
| C．electric | D．ceremony |
blood
| A．goods | B．flood |
| C．spoon | D．childhood |
It worried her a bit ________her hair was turning gray.
| A．while | B．if |
| C．that | D．for |
— I worked till 4:00 a.m. to prepare a report for my boss.
—________ you look very tired.
| A．No doubt | B．No hurry |
| C．No wonder | D．No need |
Ifpossible,youshouldexaminealldatafields______.
| A．severe | B．available |
| C．cautious | D．previous |