Put the verbs in brackets in the Past Perfect or Past Perfect Continuous.
The students were celebrating because they (pass) ... their exams. Our boots were muddy because we ... (play) football all morning. I didn't know they (listen) ... to me practising the guitar all afternoon. She was out of breath because she (run) ... I didn't recognise Bill. He (dye) ... his hair orange! She was angry because I (not phone) ... her for over a week. He was worried because he (lose) ... his passport. The sea was warm because the sun (shine) ... on it all day. Sue didn't come to the party because nobody (tell) ... her about it. They (not go out) ... with each other very long before they got married.