They were going away without saying anything ______ nothing had happened.
Chọn đáp án C
I do not want to hear any more complaints. I have got enough problems ______ it is.
The whole country was very upset ______ the President was assassinated.
______ my mother was cooking in the kitchen, my father was working in the garden.
It was such a boring film that we left the movies before it ended.
There were ______ on the subject that we did not know where to begin.
Some people are not convinced that there is a serious risk to their health from smoking ______ tobacco firms put a health warning on every packet of cigarettes.