仿照例句，将下列句子合并为含定语从句的复合句。

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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