23．It is______ you’re tired; you’ve been walking for hours．

—Who did you stay with ?—_____________.                           

In a debate, you have to be clear of the ______ of the disabled children.

Over two thirds of the population were believed to have no ______ to the health care in the west rural area in China.

If you want to get more information on how to apply for studying overseas, you can go to the office of foreign      for details.