------What’s the matter with you? ------I have a ___________.I have to see the dentist.
Food safety is important. Rules ______ to stop people from food pollution.
There will be a stamp show in the museum ______ we visited last week.
— Linda, could you tell me ______? — He is an actor.
Smoking is not allowed in public places since May 1st. It may be a good chance for some people to ______ smoking.
The Internet is really ______ to us. We can easily find the information we need.