Food safety is important. Rules to stop people from food pollution.
There are about two _________students in our grade.
It’s too cold. How about _________?
—Is your father a doctor? —No, he is a _________. He works in a school.
—Hi, _________ are you going? —To the zoo. I want to see some animals.
Please listen to the teacher carefully, don’t _________ of the window.