1. 根据句意及汉语提示完成单词。

1. （1） She(假装)to be interested, but I could see she wasn't.

3. （2） It's surprising that this old custom should have(再盛行)．

5. （3） We always(庆祝)our wedding anniversary by going to dinner.

7. （4） To avoid(混乱), the teams wore different colors.

9. （5） Slavery was(废除)in the US in the 19th century.

11. （6） Many words in the English language are French in(起源)．

13. （7） He rubbed out the (记号) on his book.