仿照例句，將下列句子合并為含定語從句的復(fù)合句。
Example: I like these singers. They write their own music.
→ I like these singers who write their own music.
1. I like Maria. She is clever and friendly.
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2. Here is the key. You're looking for it.
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3. This is the best movie. I have seen it.
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4. Do you know the girl? She is making a telephone call.
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5. Let's go to the new sports center. It has just opened in our town.
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