As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
| A．exposure | B．distribution | C．expansion | D．emission |
During the test we were supposed to stay in our seats , keep our eyes on our work , to anyone .
| A．but could not talk | B．instead of speaking |
| C．rather than speak | D．and not speak |
The moon is the earth .
| A．as big as forty-nine times | B．forty-nine times bigger than |
| C．as big as one-third | D．one-third the size of |
—Have a good rest ; you need to your energy for the football match this afternoon .
—Thanks a lot .
| A．leave | B．save | C．hold | D．get |
This is the book I bought yesterday , I spent 8 yuan .
| A．on which | B．for which | C．in which | D．at which |
Jack had traveled six miles across the Channel his engine failed and was forced to land on the sea .
| A．when | B．until | C．after | D．since |