The Australian boy has a good ________ of Chinese and can express himself freely in it.
| A．power | B．command |
| C．demand | D．usage |
--- Some Chinese students find it difficult to understand native speakers when in London.
--- Exactly, they’ve learned a lot about grammar and known many words.
| A．if only | B．now that | C．as if | D．even if |
We forbid _____________here. Who permits you_____________？
| A．smoking; smoking | B．smoking; to smoke |
| C．to smoke; to smoke | D．to smoke; smoking |
It’s quite impossible that it will rain tomorrow. But if it _______, I would still go to the park.
| A．should rain | B．would rain | C．rains | D．had rained |
_____ scores of times, but he still couldn’t understand it.
| A．Having explained | B．Having been explained |
| C．Though it was explained | D．It was explained |
--- He was nearly killed by a car once.
--- Oh. when was________ exactly?
--- It was in 2002 __________ he was riding a bike on the drive-way.
| A．this; that | B．that; when | C．that; that | D．this; when |