Food safety is important. Rules____ to stop people from food pollution.

—Where ________ I meet you tomorrow morning?—I haven't decided the place.But I'll call you soon. 

(2013·济南一模)—Can you keep the secret?—You ________ worry —  I'm not going to mention it to  anyone.

— Jim is very sick these days. He coughs so badly.— In my opinion, he really ________ listen to the doctor and cut down on smoking.

We find ------interesting to learn history.