Past Perfect or Past Perfect Continuous

1)I forgot I ...... the gate and my mom couldn`t get in.

2.) His hair and clothes were wet becouse he ....... in the river.

3) It was a fantastic experience because I had never ........ in a plane before.

4) I rejected the invitation when I found out he ....... ten years in prison.

5) They were tired because they .......... .

6) She was upset because her dog ........ away.

7) The students were happy because their exams ........... .

8) They could afford a holiday only after they ........ for two years.

9) He had very little money because he ........ his job.

10) His hands were dirty because he ........... his motorbike all afternoon.

11) She didn`t know they ............ her.

12) Had you already ...... Mark his birthday present when we gave him ours?