---Are Mr. and Mrs. Wang living alone in the house? ---Yes, they have three sons, but ______ of them live in their own houses.
After a 3-week winter vacation, students usually _________ some weight when they return to school.
The more careful you are, ________mistakes you’ll make.
---________does she study English? ---________ working with a group.
— I haven’t got a partner _________. — Maybe you can ask John for help.
— My grandpa learns English for two hours every day, _________ he is over70. — Really? We should learn from him.