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Here are the correct answers for your sentences, using the proper form for conditional sentences:

1. If he comes here faster, he will see her.
2. The environment will be clean if you do not throw rubbish.
3. If we do not have water, we will not live.
4. If Linda learned harder, she would get high marks.
5. I would love him if he were handsome.

Explanation:

• Sentences 1, 2, and 3 use the first conditional, which talks about real situations in the future (if + present simple, will + base verb).
• Sentence 4 is a second conditional, which talks about unreal or hypothetical situations in the present or future (if + past simple, would + base verb).
• Sentence 5 also uses the second conditional, as it's a hypothetical situation. The verb "were" is used instead of "was" in formal English for all subjects in hypothetical situations.