31．In summer, food will go bad if_________in room temperature.
| A．leaving | B．left | C．being left | D．having left |
-----Shall we go to the art exhibition right away?
-----_____.
| A．It’s your opinion. | B．I don’t mind. | C．It’s all up to you. | D．That’s your decision. |
It was a matter of________ would take the position.
| A．who | B．whoever | C．whom | D．whomever |
In China, all the students work hard at school _________ going to university for higher education in the future.
| A．in the habit of | B．in the hope of | C．in search of | D．in honor of |
—I’m sorry．That wasn’t of much help．
— Oh, _______ . As a matter of fact，it was most helpful．
| A．sure it was | B．it doesn’t matter | C．of course not | D．thanks anyway |
From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
| A．when | B．until | C．since | D．before |