1．It\'s not special(特別的)for the young men to finish the hard work in such a short time.
2．Can you tell me where the public toilets(廁所) are?
3．Mr.Wu talked about some social(社會的) problems.
4．For certain(某種)reasons，Mr.Li left there without saying anything.
5．Jack is an honest(誠實的) boy，so we all like him very much.