AIDS is said __________ the biggest health challenge to both men and women in that area over the past few years.
A. that it is B. to be C. that it has been D. to have been
When and where to go for the on-salary holiday __________ yet.
A. are not decided B. have not decided
C. is not being decided D. has not been decided
–Can you judge where he comes from?
-His accent gave him __________ as a northerner.
A. off B. away C. up D. in
__________ is known to everybody, Taiwan is a part of China. We must unify it.
A. It B. As C. That D. What
__________ I toured the Great Wall, I was deeply impressed with the beautiful scenery.
A. For the first time B. At first
C. It was the first time D. The first time
On __________ latitude of South Hemisphere (半球) and North Hemisphere, the seasons are just the opposite, for example, summer and winter.
A. the same B. different C. similar D. opposite
