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 |
We got lost in the forest and decided to remain ________ we were and waited for rescue.
| A．where | B．what | C．how | D．who |
---I’m frustrated after so many failures. I can’t see any hope.
---Behind every misfortune ________!
| A．lies an opportunity | B．does an opportunity lie |
| C．an opportunity lies | D．is an opportunity lying |
Unemployment is on the increase. A growing number of young people,
, are finding
themselves out of work.
| A．in case | B．all in all | C．in particular | D．as a result |
---Now more and more Chinese senior students are applying for admission to American universities through SAT.
---________. But taking an SAT may cost one more than 10,000 yuan.
| A．I hope so | B．Not really | C．That’s the case | D．That sounds reasonable |
Play, often _______ as an activity for young children, is still important in the social development of teenagers.
| A．to see | B．seeing | C．to be seen | D．seen |