______ regular exercise is very important,it's never a good idea to exercise tooclose to bedtime.(2011 .天津)
| A．It |
| B．As |
| C．Although |
| D．Unless |
________ around the Water Cube，we were then taken to see the Bird’s Nest．
| A．Having shown | B．To be shown |
| C．Having been shown | D．To show |
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 |