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Ответ:

2. They can't see each other

3. They often write to each other

4. They don't know each other

5. They're sitting next to each other

6. They gave presents to each other

Ответ:

They can’t see each other.

They often write to each other.

They don’t know each other.

They are sitting next to each other.

They gave each other a present.