The output of the gold mine is now four times _____ it was before liberation.
| A．that | B．what | C．which | D．than |
When he made a speech, the gathering ____ thunderous applause.
| A．burst into | B．burst out | C．made out | D．cried out |
It’s the gases ___ natural gas and the burning of coal give off ____ add to the overheating of the earth.
| A．that; what | B．that; that | C．which; which | D．that; which |
The teacher doesn’t believe his reason for being absent from class ___ he was ill, ____mad him sad.
| A．that ; which | B．why; which | C．why; what | D．that ;what |
—— Bob has gone to California.
—— Oh, can you tell me when he _____?
| A．has left | B．left | C．is leaving | D．would leave |
It’s easy to learn a country’s culture if one is ____ with its language and customs.
| A．similar | B．familiar | C．sensitive | D．flexible |