When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world.
| A．broke off | B．broke down | C．broke out | D．broke away |
_____ all the inventions have in common is ______ they have succeeded.
| A．What; what | B．That; what | C．What; that | D．That; that |
Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
| A．that | B．as | C．so that | D．which |
A cook will be immediately fired if he is found ______in the kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |
It was with great joy ______ he received the news that his lost daughter had been found.
| A．because | B．which | C．since | D．that |
Henry can’t attend the party _______ at Tom’s house at present because he is preparing the speech at the party _______ at Marie’s house tomorrow.
| A．held; being held | B．to be held; to be held | C．to be held; held | D．being held; to be held |