31. Look at the notice. You are not allowed _______ the gymnasium without permission.
| A．to enter | B．enter | C．for entering | D．Entering |
With so many good friends together with you, you must have been happy during the past National Golden Week, _____?
| A．haven’t you | B．didn't you |
| C．weren’t you | D．mustn’t you |
There are more than 740 million Chinese _______ to second-hand smoking in public places now.
| A．are being exposed | B．exposed |
| C．to expose | D．having been exposed |
When word came _______ Zhang Bichen became the winner of the “Voice of China 2014”, her fans, greatly excited, stood up cheering for her.
| A．that | B．what | C．which | D．where |
—Could I smoke here?
—I’m afraid smoking is not allowed here. If you _______, go to the smoking room, please.
| A．could | B．must | C．would | D．might |
Food is easy to _______ on hot summer days so it should be cooled or frozen.
| A．break away | B．put away |
| C．go off | D．give off |