1. Mathematics is(are) my favorite subject. ___________ 2. They have no time to waste. ___________ 3. Have you ever been(gone) to Hangzhou? ___________ 4. He asks me what we shall do after lunch. ___________ 5. I had done my homework yesteray. ___________ 6. A number of students are there. ___________ 7. Here are two books. Which one do yo like better? ___________ 8. the boy is old enough to go to school. ___________ 10. 10.Between you and him, there is a difference. ___________ 11. They are talking with each other. ____________