______ is known to all, the earth travels round the sun once every year．
| A．That | B．As | C．What | D．It |
________ breaks the law should be punished.
| A．No matter who | B．Anyone |
| C．A man who | D．One |
During the war lots of families _______ and a large number of people became homeless.
| A．broke up | B．broke away | C．broke off | D．broke out |
Press this button when the light goes on – you’ll soon get the hang of it.
| A．learn how to do | B．hang on |
| C．hang off | D．show how to do |
-- I’d like to invite you to a concert this evening.
-- Thank you, but _______ I’ll be free I’m not sure at the moment.
| A．while | B．if | C．whether | D．when |
The rising unemployment was the most important ________ at Congress.
| A．issue | B．question | C．problem | D．plan |