Taking photos with _____ real tiger is _______ unusual experience for us.
| A．an; an | B．a; an | C．the, a | D．a; a |
— Everyone should help save the planet.
— Yeah. I’ve stopped ______ plastic bags when shopping.
| A．to use | B．using | C．use | D．used |
Teachers will hardly use chalk in the future, ______?
| A．will he | B．won’t he | C．will they | D．won’t they |
— What nice coffee!
— But I think it will taste ______ with sugar.
| A．well | B．bad | C．worse | D．better |
— What’s wrong with you, sir?
— My flight ______ ten minutes ago. What should I do?
| A．took up | B．took off | C．got on | D．got off |
It began to rain ______ I was walking in the park.
| A．until | B．because | C．while | D．although |