Rewrite sentences with the same meanings of the root ones

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D. Writing: (2 pts)
* Rewrite sentences with the same meanings of the root ones:
1. David had gone home before we arrived.
| I
2. Science and technology have changed human life.
3. He doesn't work hard. He doesn't pass the exam.
- If . .
4. Because the weather was awful,we didn't enjoy our camping holiday.(due to)