Правильно написано
1.She should sleep.
2.He should wash hands
3.They should brush hairs

 Could I have a glass of water, please?
 Sure. Would you like still or sparkling water, or water from the tap?
 Можно стаканчик воды
 Конечно! Вам газированной воды,негазированной или из крана? 

Could you tell me where the bathroom is, please?                                            Certainly. It’s upstairs and the first door on the right
Не подскажете, где у Вас ванная комната?
Конечно! На втором этаже первая дверь направо. 

It's a bit stuffy in the room, isn't it?
Do you want to go outside for some fresh air?
В комнате душновато немного, не так ли?
Не хотите выйти подышать свежим воздухом?

Would you mind my smoking here?
I'm afraid I would.  I don't  like people smoking in the room.
Вы не будете возражать, если я закурю?
Боюсь, что буду. Мне не нравится, когда люди курят в комнате.

1. Who is the most hard-working student in your class? - Ivanov is the most hard-working student in our class .
2. Who is the best at sport in your class? - Stas Petrov is the best at sport in our class.
3. Who is the most friendly student in your class? - Nina Smirnova is the most friendly student in your class.
4. Who is the most talkative student in your class? - Sergey Sosnov is the most talkative student in our class? .
5. Who has got the longest hair in your class? - Marina Drunova has got the longest hair in our class.