What’s the matter–______.

In order to ______ a good knowledge of English, he gave up his job and went to study in an English training center.

u wait for him long—No, I hadn’t waited long _______ heappeared.

Johnson hasn’t felt any effect the new dieting recipe has himsince he tried to lose weight three months ago.

The famous scientist was goingout _____ he found himself surrounded by lots of young people.