The girl was working hard. She hoped to finish cleaning the house _____ her mother came back home.
| A．before |
| B．till |
| C．after |
| D．since |
The Science Museum, _____ we visited during a recent trip to Britain, is one of London’s tourist attractions.
| A．which | B．what | C．that | D．where |
_____ was most important to her, she told me, was her family.
| A．It | B．This | C．What | D．As |
—How about buying Sam a mobile phone? After all, he isn’t a boy any more.
—I think it’s necessary, for we sometimes want to make sure if he ______home for dinner.
| A．will come | B．comes | C．has come | D．would come |
Mother told Jim to watch the milk until it boiled and then _____ off the gas.
| A．turn | B．turning | C．turned | D．having turned |
—May I go and play with Dick this afternoon, Mum?
—No, you can’t go out _______ your work is being done.
| A．before | B．until | C．as | D．the moment |