5 Underline the correct word.

Решение:

1. They were happy so they passed the test.
2. They are sleeping now because they are tired.
3. The house was messy, so I cleaned it.
4. She has got a broken leg so she had an accident.
5. He was ill, so he went to the doctor.

Ответ: 1. so, 2. because, 3. so, 4. so, 5. so.