When the boss got to the factory ________ midnight, he found it ________ ruins.
| A．on; in | B．at; under | C．at; in | D．on; under |
________swallow（燕子）doesn’t make ________ summer.
| A．One; a | B．One ; ／ |
| C．A; the | D．A; ／ |
--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 |
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 |