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1. When autumn
   [ ], the days
   [ ] shorter and the nights
   [ ] longer.
2. We
   [ ] sunscreen when we
   [ ] to get tanned.
3. If you
   [ ] too much coffee, you
   [ ] tired.
4. The apple pie
   [ ] better when you
   [ ] both sweet and sour apples.
5. When you
   [ ] in danger, adrenaline
   [ ] on the fight-or-flight response, which
   [ ] you to struggle or to flee from the danger.
6. If you
   [ ] a raw egg into a hot spring, it
   [ ] in less than an hour.
7. When people allergic to shellfish
   [ ] shrimps, their skin soon
   [ ] with an itchy rash.