More and more high-rise buildings have been built in big cities________ space.
_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined.
—How did you like the concert last night ? —I enjoyed it very much, but the dancers _____ a better job.
I appreciate _____ the opportunity to work in your company two years ago.
_____ economic, political and cultural differences, it is difficult for China and America to fully understand each other.
Disadvantages as they have, online games never fail to _____ a large number of teenagers.