1 . 一般来说，英语单词有一定的构成规则，了解这些规则可以帮我们记单词和猜测单词含义。最常见的构词法有合成法和派生法。像classroom, notebook, girlfriend等通过“单词+单词”形式构成的单词，叫合成词。像teach→teacher, sun→sunny, happy→unhappy, like→dislike等通过在原词基础上加后缀或前缀构成新词的方法叫派生法。请结合你对构词知识的理解，结合下列上下文，猜测划线单词的含义。写出划线的汉语。
1. He wants to be a sportsman.
2. She comes from Qingdao. She likes seafood.
3. What's this, madam? Oh, it's a starfish.
4. I think Beethoven is a great musician in the world.

2 . Look at the picture clue(线索). Please write the missing word.

___________

3 . —National Day is coming in       .
—Great. We will have a        vacation.

A．seven days, seven day’s time	B．seven days’, seven days’
C．seven-day, seven days	D．seven days, seven-day