— It’s dangerous to swim in this river.— Yes, you are right. The government has _________ people not to swim in it.
---- __________________?-----For two hours.
_________ does Jim surf the Internet?Once a week.
_______he is busy, ________he helps us often.
Your child is only five. Is _____necessary for you to be so strict with him?
My mother always has__________ housework to do on weekends.