__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once | C．Though | D．Unless |
We went to the West Lake yesterday, ___, not surprisingly, was crowded with visitors from all over the world．
| A．where | B．which | C．that | D．when |
—Mum, where is my raincoat?
—Oh, I forgot to tell you．It ___ behind the kitchen door．
| A．would hang | B．has hung | C．is hanging | D．hung |
The dining room is clean and tidy, with a table already___ for a big meal．
| A．laid | B．laying | C．to lay | D．being laid |
It is really ___ useful dictionary, ___ dictionary every one of us needs．
| A．an, a | B．a,the | C．the, a | D．a, a |
Many people agree that there has never been a more splendid opening ceremony than
___ of the Guangzhou Asian Games in history．
| A．one | B．that | C．which | D．this |