is no doubt that the Great Wall is one of the wonders of the world

How did you like the lecture tonight?— Very________.I doubt if I will come to this kind of lecture next time. [ ]

ory is about an old Indian villagerand an American tourist in India, _______ understanding the other’s language

______, how long does it take you to fly to Xi’an from Nanjing — About 2 hours.

Mr. Smith is quite generous and warm-hearted, a person______ you can turn when having trouble.