That was the fourth time that Mr. Smith __________the Summer Palace.

What’s the matter with John? He has been sitting there for hours.— A postcard from his father_______ an attack of home-sickness in him.

People, especially teens, think it_______great fun to surf on________ Internet. — I agree with you.

cold. She can’t cometo school today. — ________.

— How about the book you are reading now?— Excellent indeed You can find many problems we have come across ________ in it[ ]