СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА!!!!! 5 задание даю 30 баллов

1.Kate has watered her plants.
2.Mum has opened window in her bedroom.
3.Mery has watched this film.
4.My friends have visited the British Museum.
5.Emma has washed her hairs.
6.хз.
7.Jake has cooked his supper.
8.Mary’s friends have arrived in London.
9.Peter has changed his clothes.
10.The sister has discover her book.

Очень странное задание.