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15.They ___________happy together.

they是第三人称复数，后面跟are。

完整的句子是： They are happy together. 他们在一起很快乐。

读一遍完整的文章：

These are Michael and Joseph.They are brothers. They are 16 years old. They are both short and slim. They are in the same class. They are always together. They are from London. Their favourite football team is Liverpool and their favourite singer is Madonna. Michael's hair is blonde and wavy but Joseph's hair is dark and straight. Michael is good at Mathematics and Joseph is good at Physics.They are both interested in seeing new places and camping. Their house is in the country. It is a small cottage. Their father is a bus driver and their mother is a shop assistant. They are happy together.

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