I lent my bike to Li Lei. May I ____________ yours, Mary?－ Certainly. Here is the key.

Do you know ______ man in blue? –Yes, he’s a professor of_________ university.

Did you go aiking with your family last weekend? — No. __________, that we had to give up our plan.

How many students in your school have lunch at home? — Only ________ of us have lunch at home.

What a clean and bright classroom, isn’t it?—Yes, it’s always clean and bright because it every day.