1 . 选词填空

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1. Computers can be used to_________language learning.
2. Hard work is_________to success.
3. Gathering data on how animals sleep in their natural habitats has always been _________and hard to do.
4. With the company of his younger_________, the old man felt more and more energetic.
5. If more_________are studied, the scientific conclusion will be more accurate.
6. Military_________will only make the conflict between these two opposing countries go further.
7. _________advice will be more useful for young men than vague praise.