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1.  Mother's Day is on the second Sunday _____ (五月) in a year.
      Children usually send flowers to their mothers.
2.  One of my _____ (牙齒) hurts badly. I must go to see a doctor.
3.  Listen carefully in class and you are sure to understand the teacher _____ (容易).
4.  If _____ (可能), I'll go to Beijing to visit Tian'anmen Square this summer.
5.  The ____ (因特網) has become an important part of our life.
      We all like surfing on it.
6.  When I meet with difficulties, the teacher often encourages me
      to work them out by  m_____.
7. The sign "No P_____" tells you not to stop your car here.
8. Yesterday she didn't go out to play with her friends. I_____,
      she stayed at home to help her mother do some housework.
9. When s_____ comes, trees turn green and flowers come out.
      It's the best season of the year.
10. I like Chinese tea w_____ anything in it, but my friends John likes
     tea with some milk.