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Ответ:

They are happy because they have good grades

They are confused because they don't know answer

He is proud because he cooks delicious cake

They are frightened because they watch the movie

He is angry because he plays game

They are happy because they get good grades

They are confused because they don't know answer.

He is proud because he makes delicious cake.

They are frightening because they watch a movie.

He is angry because he plays a game.