The technology of electronic products is ________changing, so you needn’t follow the fashion.
| A．rarely | B．approximately | C．automatically | D．constantly |
It was nine years ago, when I came to China for the first time ____ I began to learn Chinese.
| A．where | B．how | C．that | D．which |
If you really have to leave during class, you’d better leave____ the back door.
| A．for | B．at | C．by | D．out |
----Do you think it wise for Chinese mothers to try to do everything for their children?
----No, that’s they are mistaken.
| A．what | B．when | C．where | D．how |
Everyone must ___ their notebooks on the desk while taking an English exam.
| A．put away | B．put down | C．put off | D．put up |
He is rather difficult to make friends with, but the friendship of his, _____, is truer than that of anybody else’s.
| A．while gained | B．when to gain | C．after gaining | D．once gained |