We don’t allow ___in the office. But you are allowed ____in the rest room.
| A．smoking, smoking | B．to smoke, to smoke |
| C．smoking, to smoke | D．smoke, smoking |
The two researchers originally set out to study the zebras in Africa and discovered a new species of tiger _______.
| A．by chance | B．in addition |
| C．by nature | D．in return |
The villagers are extremely thankful to him, without whose help the road to the village ________.
| A．can’t be built | B．couldn’t have been built |
| C．mustn’t be built | D．mustn’t have been built |
________ into English, the sentence was found to have an entirely different word order from Chinese.
| A．Translating | B．To translate |
| C．Translated | D．Having translated |
They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
| A．would have come | B．could come |
| C．have come | D．had come |
--Jack, I’d like to have your opinions about my written report.
--. But I have one suggestion.
| A．That’s a good idea | B．You are too modest |
| C．It looks fine to me | D．You should check it first |