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He learned a lot of things while he was in the country.
He met an old friend while he was walking on the street.
Let's wait here until he comes back.
While I was doing my homework, my brother was reading a comic book.
As she was very tired, she decided not to go swimming.
Although it was very late, she decided to go out.
You have to do your homework before you watch television.
Though she was very tired, she practiced the piano.
Does your brother always brush his teeth before he goes to bed?
Although the stone was very heavy, he tried to lift it.
Please wash the dishes after you eat dinner.
I have to stay at home until my parents come back.