You see the lightning _____ it happens, but you hear the thunder later.
| A．for an instant | B．on the instant | C．in a instant | D．the instant |
I need to call my friend David coat I took away by mistake yesterday.
| A．whose | B．of which | C．that | D．of whom |
is mentioned above, the number of the students who would like to further their education abroad is increasing.
| A．Which | B．As | C．That | D．It |
I visited Mr. Johnson during his stay in Shanghai he attended a most important conference there.
| A．when | B．which | C．where | D．in which |
The time is drawing near food raised in space will directly benefit human below.
| A．where | B．when | C．whether | D．why |
Electrical products no longer in use contain dangerous materials which can be released into the environment when they are _____.
| A．taken apart | B．given away | C．fixed up | D．handed over |