用所给单词的适当形式连词成句
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用所给单词的适当形式连词成句
1 We will come out when the sun shines.
2 She was studying at college while the war broke out.
3 We all stopped talking when the teacher came in.
4 He lost his pen when he went sightseeing in the city.
5 I saw him while he crossing the street .