One reason why he succeeds is ______he is good at thinking in different ways.
| A．because | B．as | C．which | D．that |
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 |
______ environmental damage is done，it takes many years for the ecosystem to recover．
| A．Even if | B．If only |
| C．As if | D．Once |
----- I'm going to San Francisco for a couple of days.
------ ________. I wish I could get away for a while.
| A．It doesn't matter | B．Forget it |
| C．I really envy you | D．I can't agree more |