If someone is________, he works very hard.
A. real    B. hard-working    C. careful

If a way of doing something is _____, it is very useful or suitable for a particular purpose.
A. different    B. convenient    C. simple

Your_______ is the number of your house and the name of your street and your town.
A. address    B. fair    C. direction

To _______someone means to give them confidence(信心)，for example by letting them know that what they are doing is good and they should continue to do it.
A. help    B. accept    C. encourage