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Тема Perfect Continuous Tenses

Fill in the gaps with the correct Perfect Continuous forms of the verbs in brackets:
1. Before the boy came home, he ________ at the library for some hours. (to work)
2. I ________  for them for two hours. (to wait)
3. In half an hour, I_________ a car for five hours.Let`s stop for a break. (to drive)
4. She _________ TV for the whole day. It`s boring.(to watch)
5. They were tired. They ________for three hours. (to work)
6. In two days, they _______ English for four months. (to practise)