7. Должно быть, у них разные вкусы,

7. Должно быть, у них разные вкусы, иначе они бы пришли к общему мнению. 8. Очевидно, он ответил на ее предложение холодным отказом, иначе она была бы не такой грустной.

Результаты (английский) 1:

7. they must have different tastes, otherwise they would have agreed. 8. Obviously, he responded to her offer cold refusal, otherwise it would not have been such a sad.

Результаты (английский) 2:

7. Must be they have different tastes, or they would have come to a consensus. 8. Obviously, he responded to her refusal to offer cold, otherwise it would not be so sad.

Результаты (английский) 3:

7. they must have different taste, otherwise they would have come to a common view. 8. obviously, he replied to her the cold out, otherwise she would not be so sad.