Carbon dioxide, which makes a ______ between us and the sun, prevents heat from getting out of the atmosphere easily, so the earth is becoming warmer.
| A．difference | B．comparison | C．connection | D．barrier |
---Have you got any particular plans for the coming holiday?
---Yes._____, I’m going to visit some homes for the old in the city.
| A．If ever | B．If busy | C．If anything | D．If possible |
It __be the vocabulary that caused you the problem in the exercise because you know a lot of words.
| A．may | B．couldn’t | C．should | D．needn’t |
--How did you find the film yesterday evening?
--Just so so. It _______ pace.
| A．lacked in | B．lacked | C．was lacking | D．was lacked in |
______to the sun for too long, I think, can hurt your skin.
| A．Being exposed | B．To expose | C．Exposing | D．Exposed |
—We were surprised to hear that the reason_______ she gave for her absence was______ her mother was ill.
—Yes，we saw her mother was at the supermarket that morning.
| A．why；that | B．which；that | C．that；because | D．why；because |