Write the past simple of the following verbs

Đề bài : Write the past simple of the following verbs
1: clean..........
2:return.........
3:stop.............
4:stay..............
5:walk..............
6:shop............
7:look.........
8:tidy...........
9:smile................
10:cry..........
11:water...........
12:drop...............
13:call.............
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