Ответ:

She was excited because she hadn't seen a play before.

Did you like the cake she had baked?

He had heard the song on the radio before he bough the CD

They were tired because they had played football.

She was sad because she had lost the game.

The match had already started when they arrived at the stadium.

Ответ:

5 She was excited because she  hadn't seen a play before.

6 Did you like the cake  she had baked?

7 Не  had heard  the song on the radio before he bought the CD,

8 They were tired because they  had been playing football.

9 She was sad because she  had lost the game.

10 The match  had already started when they arrived at the stadium.