Ответ:
Ex.1:
1.She has to buy some food.
2.She had to buy some food.
3.She will have to buy some food.
4.Peter and Tom will have to work hard.
5.Peter and Tom had to work hard.
6.Peter and Tom have to work hard.
Ex.2:
1.D
2.А
3.F
4.E
5.G
6.тоже G
7.C
8.B
9.тоже В