Some teenagers _______ their health because they often expose themselves to so many electric products.
| A．have damaged | B．are damaging | C．damaged | D．will damage |
My father did buy the CD, ________ he actually doesn’t appreciate the music in it at all.
| A．so | B．because | C．while | D．or |
Jim who is now our English teacher once ________ as a manager in an international
cooperation for 5 years.
| A．worked | B．had worked |
| C．was working | D．has worked |
_________ a certain doubt among the students as to the necessity of the work.
| A．It existed | B．There existed |
| C．They had | D．There had |
You ______ scold such a pupil who always keeps silent so seriously that you ______ hurt him.
| A．should; can | B．may; will |
| C．mustn’t; may | D．can’t; must |
A new iphone costs about _________of a second-hand one．
| A．the price of three times |
| B．three times the price |
| C．as much as the three times price |
| D．three times more than the price |