Think of reasons for those situations. Complete the sentences. Use the Past Perfect or the Past Perfect Continuous.

1. He was unhappy because he had failed his tests. 2. Our teacher was angry because we had forgotten to do our homework. 3. She had a terrible headache because she had been working on the computer for hours. 4. The children came back home very tired because they had been playing football all afternoon. 5. She was late because her train had been delayed. 6. They were wet because they had been walking in the rain.