In America and Europe, it is __________ to tip anything from 10% to 20%.
| A．customary | B．custom | C．customer | D．customs |
Mrs.Black doesn’t believe so many people are suffering from this tsunami，__________?
| A．aren’t they | B．are they |
| C．doesn’t she | D．does she |
If you want to learn about Liu Xiang，let me know，__________you?
| A．don’t | B．will | C．shall | D．do |
About 60 percent of the students __________from the south; the rest of them __________from the north and foreign countries.
| A．are; is | B．is; is | C．is; are | D．are; are |
Each man and each woman __________ asked to help when the fire broke out.
| A．is | B．was | C．are | D．were |
On the closet__________ a pair of trousers his parents bought for his birthday.
| A．lying | B．lies | C．lie | D．is laid |