The Great Wall winds its way _____ mountains _____ valleys and _____ deserts to the east.
| A．over; in; through |
| B．over; through; across |
| C．on; in; across |
| D．in; in; through |
I have ______ all the papers but I still can’t find my notes．
| A．looked for | B．looked through |
| C．looked after | D．looked out |
_____in the sports world，a sportsman needs to train constantly to keep himself in best condition．
| A．Survive | B．Surviving |
| C．To survive | D．Survived |
Teenagers ________ their health because they play computer games too much．
| A．have damaged | B．are damaging |
| C．damaged | D．will damage |
Peter’ shirt looked just the same as Tom’s，but it cost ______ his．
| A．as much twice as | B．twice as much as |
| C．much as twice as | D．as twice much as |
We can’t figure out ______ quite a number of insects and birds are dying out．
| A．that | B．as | C．why | D．when |