Food safety is important. Rules must ________ stop people from food pollution.

Zhengzhou will be more and more convenient when Zhengzhou Subway_____ in two years.

— I didn’t see you at Kangkang’s birthday party.
— I didn’t go because I _____ .

English _____________ in more and more countries today.

— Food problem is becoming a big one in China!
—I think the food ________ before going to shops or supermarkets.