____ modeling business is by no means easy to get into, the good model will always be in demand.
| A．While | B．Since | C．As | D．If |
By sunset we had ___ thirty miles.
| A．taken | B．covered | C．reached | D．added |
Jack, go and get some chalk, ___?
| A．will you | B．shall we | C．do you | D．shan’t we |
You’d better leave the book ___ they can find it.
| A．where | B．which | C．in which | D．in the place |
There were only a __ number of students in the playground.
| A．few | B．little | C．good | D．small |
The dictionary written by Professor Wang is worthy __.
| A．of buying | B．buying | C．of being bought | D．to buy |