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Here's how you can complete the sentences:

1. If it rains, we won't go out.
2. It’s cold! I will turn on the heating.
3. If the weather is good, we’ll go on a picnic.
4. You can ask John that question when he comes.
5. I think Manchester will win the match.
6. Maybe I will become a writer when I grow up.
7. If I hear anything about the accident, I’ll let you know.
8. He always locks the door when he leaves for work.