Rick has learned a lot about Chinese culture _____ he came to China.
| A．before | B．when | C．until | D．since |
He never ______learning English. That was why he was successful at last.
| A．gave in | B．gave out | C．gave up | D．gave away |
My mother has had the clothes _______already．
| A．was washed | B．was washing |
| C．to wash | D．washed |
--It's too cold. Would you mind closing the window?
-- ______ . But please don't do it now.
| A．Of course not | B．Better not |
| C．That's great | D．Good idea |
—Would you please show me an iPhone5, please?
—Sorry, sir. There’s ______ left at the shop.
| A．nothing | B．none | C．no one | D．nobody |
Sometimes I feel stressed, but I don’t know ______for help.
| A．who to talk | B．who should I talk to |
| C．who to talk to | D．which one to talk |