Question

Answer 1

8 Tom couldn't apply in the exercises although he understands the lesson

9 Because they played very well, they won the game

10 Tom couldn't bring the suitcase because it is heavy

Answer 2

8.Tom couldn't apply in the exercises although he understands the lesson.  
9.because they played very well,they won the game.  
10.Tom can't bring it because the suitcase is too heavy

Answer 3

8.Tom couldn't apply in the exercises although he understands the lessons

9.Because they played very well, they won the game

10.Tom can't bring the suitcase because it is too heavy