The food safety is a serious ________ in our country.We should try to solve it.
My dad ________ a teacher when I grow up .
— _______ do you use the Internet a week? —Twice.
“85%of the students in our class like English.” means “ _____students in our class like English.”
_______ he was tired, _____ he didn’t stop ______.
Tom studies _______. He _______plays with his friends.