20 When I (come), he (watch) TV
21. When she (arrive), I (do) my homework
22. When Ba (phone), she (sleep)
23. When I (meet) her, she (hurry) to the station
24. They still (sleep) well when their father (come) back home from work
25. Tom (paint) his house when we (come)
26. Hoa (wash) ...
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