You seem to be familiar with this city. – I_______ here for three years. It’s great to be back.

new bridge has been built overChangjiang River in Huangshi.

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

I didn’t see you at the party yesterday. Why? — Because I ________ for an important person from America at that time.

Sam is a very good man. He always tries __________ best to help others.