The computer system ________ suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out |
| C．broke up | D．broke in |
This is the very toy car ________ which he came here the other day.
| A．by | B．in | C．for | D．on |
Spacecraft “Discovery” has failed in the course of launch.
----_______? They have been preparing for the test.
| A．How come | B．When | C．How | D．Why not |
I began to fish before memory began, _______ I know I have always fished.
| A．so far | B．so as far as | C．as far as | D．so |
Elbert Einstein, for ______ life had once been very hard, was successful later in science .
| A．whom | B．whose | C．which | D．his |
In my opinion, all Mr Tom ______ good to his students in his class at present. He is very strict in their study.
| A．does does does | B．does do do |
| C．does does do | D．did do does |