Найдите русские эквиваленты... a crystalline substance; are necessary for the growth and health; may be harmful ; certain foods are the best sources of each body requirement; resistance to infection;

i am not hungry. i have had lunch.

.1.-open the window.

-but i have opened the window.

2.i have seen the film.

3.he has opened the door.

4.they have cleaned the room.

1)  i use to live in the country, but now i don't.

2)  did you used to wear glasses?

3)  they didn't use to do any homework.

4)  he has a motorbike.

5)  we used to play in the park when we were little.

6)  she used to cry a lot when she was a baby.

остальные корректные

1.) it (was) sunday yesterday and they (were) at home.

возможен и этот вариант:

  it (was) sunday yesterday and they (weren't) at home.  2.) kim (was) at her grandmother's yesterday.

возможно:

  kim (wasn't) at her grandmother's yesterday.  3.) she (is) at home.  4.) mum and dad (were) at work yesterday.  возможен и этот вариант:

  mum and dad (weren't) at work yesterday.  5.) they (are) in the village.