选择方框中的单词并用其适当形式填空，完成句子。
1. Doctors want to save more people’s __________.
2. Mum always tells me to wash hands before having meals.
3. ---Which is your favourite season? ---- I like autumn _________.
4. Please stand between Jack and __________
5. We have Biology lessons __________ a week.
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1.lives 2.first 3.best 4.her 5.twice