Rewrite the sentence with given words without changing their meanings

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* Rewrite the sentence with given words without changing their meanings.
1. Unless you study harder, you won't get good result.
=> If .....................................................................................
2. He will probably in a UFO in the future.
=> He might .........................................................................
3. I had a bad cold, so I didn't go to school yesterday. (because)
=> .........................................................................................
4. No mountain in the world is higher than mount Everest.
=> Mount Everest .................................................................
3.