Помогите избрать верный ответ.It was late. The snow _____ by the

Помогите выбрать верный ответ.

It was late. The snow _____ by the evening.
a) was stopping b) had stopped c) stopped
Lucie _____ the flat before her parents came.
a) was doing b) had done c) did
While Dot _____, her sister was doing homework.
a) was watching TV b) had watched TV c) watched TV
Long ago people _____ to shoot arrows defending themselves.
a) were using b) had used c) used
Before the teacher gave a new test, she _____ the previous one.
a) was checking b) had checked c) checked