George applied for the position three times ______ he finally got it.
| A．before | B．until | C．when | D．after |
When he entered college, he began to learn _____ language.
| A．a third | B．the third | C．a three | D．the three |
The shop manager always says to his assistants, "We can never be ______customers.
| A．so | B．too | C．that | D．more |
--Did Mary come to your birthday party?
--No. I __________ her, but she was away on business.
| A．would like to invite | B．would have liked to invite |
| C．must have invited | D．could invite |
All the preparations_____, we're ready to start.
| A．made | B．being made |
| C．having made | D．have been made |
--Do you know when the Chinese custom_________ from?
--It's hard to say. But its characteristics__________ the Tang Period.
| A．began ; prove | B．started ; show |
| C．is ; appear | D．dates ; suggest |