根据句意填单词，使句意完整。  

l. They studied English               about three years.  

2. You are              too old to learn.  

3. I was born                May 6th, 1993.  

4. Yesterday evening a boy _           Wang Lin phoned you.  

5. When did she                a movie star?

洋地黄毒糖是（）

A.6-去氧糖

B.2，6-二去氧糖

C.6-去氧糖甲醚

D.α-氨基糖

E.α-羟基糖