The computer system _____suddenly while he was surfing the Internet.

Not only English but also maths _______ my favourite subject.

Where is your father—He_________ Australia and he ________ Sydney for two weeks.

Half of the boys __________ finished the homework as some exercises __________ really difficult .

I’m afraid that I can’t do it.—Oh, you should believe in yourself. Youwon’t know what you can do______ you try it.