Помогите пожалуйста срочно!!! Нужно поставить в правильное время
1. Parents were worried because they (not hear) from him for a long time
2. I didn't know the answer because I (not read) the book
3. I think scientists (find) a cure for AIDS by the year 2050
4. Ann told her friend that she (win) the competition
5. She (cook) supper when I come home
6. When Europeans first arrived in America they thought they (land) in the West Indies
7. The boys were cold and hungry because they (walk) a long way
8. By the time I got to the library she (already left).
9. By that moment everyone (take) their seats and was listening attentively

1 hadn’t heard 2 hadn't read 3 will have found 4 had won5 had cooked/was cooking6 had landed 7 had walked8 had already left 9 had taken