Having a large family to support, Mr.Johnson had to workin the evening.

If you don’t want your parents to worry about you, you should learn to____ yourself

About one third of the population in Beijing and Shanghai ______ netizens, but in poorest areas, only three or four percent ______ online.

_______ have you been here? —I have been here for moths. [ ]

I was angry _______ him for keeping us waiting.[ ]