you’d better make sure _____ theexact time of the train before setting out．

Johnson is said to be the first young teacher professor in your university this year.—- Exactly. of his own competence is an important factor in his success.

Most computer users think it necessary for theirsoftware ________ regularly．

ents have children help with housework,the children will feel needed ,they will learn to take care of themselves

In no way should we hunt and kill antelopes_____, everyone should make great efforts to protect them