If it is very hot, they sit...
at
in
under
...the shade.

under

Объяснение:

If it is very hot, they sit under the shade.

Объяснение:

Удачи))

Iremember my first teacher very well. her name was elena a.  she and we  (мы имеется в виду ученики? предлагаю убрать she and оставить просто we   met on the first  day of school year  on a warm autumn day. she was an incredibly warm personality. she  was middle-aged of medium ( что значит средних лет середины? можно убрать of medium). she was  well -build, and had  wrinkled pale-skin with rosy cheeks.she  usually wore  brown curly hair in heatly bun ( что значит здоровая булочка? she usually made a bagel with her brown curly hair, that accented her round face)  which highlights her round face.her smile whole face lights up. she wore  light makeup and casual clothes.  (нужно определиться, в каком времени вы пишите, где-то настоящее, где-то прошлое, я все заменила на прошедшее время) she was a kind  woman and paid much attention to all of  us. she taught us how  to read and write.  she  told  us many interesting things about everything and she instructed us how to work ( работать над чем? она не могла вас учить работать в принципе). she was a  very good professional. she love d children, that  is very important in  teacher's job. i  will always remember e.a. i have only warm memories of those years.