When we visit Tibet, we can see（）

单项选择题The World Cup is being held in South Africa now.（）is one of the cities is South Afric

A. Washington
B. Ottawa
C. Toronto
D. Cape Town

单项选择题Your T-shirt is so cool. Could you tell me（）

A. where you buy it
B. where do you buy it
C. where you bought it
D. where did you buy it

单项选择题—Sharon, remember to lock the door before leaving the house. —（）

A. OK. I will.
B. Yes, please.
C. It's hard to say.
D. It doesn't matter.

单项选择题In the last few years, there（）great changes in the country.

A. had been
B. were
C. have been
D. has been

单项选择题—Where was your brother at this time last night —He was writing an e-mail（）I was watching TV at home.

A. as soon as
B. after
C. until
D. while