People come into your life for a reason, a season or a lifetime. When you_______ which one it is, you will know what to do for each person.

Nobody taught _____ Chinese. He learned all by ______.What a clever boy!

I have a computer, ______ I don’t play computer games on it.

Have you finished your fashion design—Not yet. I’ll finish it if I____ ten more minutes.

Tu Youyou is famous ____ her medical research and won the Nobel Prize this year.