I/
1/do-did
2/ teach-taught
3/ send-sent
4/ spend-spent
5/ begin-began
6/ cut-cut
7/ put-put
8/ give-gave
9/ write-wrote
10/be-was/were
11/ buy/bought
12/ have/had
13/ take-took
14/ go-went
15/ make-made
16/ think-thought
17/ see-saw
18/ eat-ate
19/sing-sang
20/ wear-wore
II/
1/ Brush your teeth after meals.
2/ Don't play soccer in the street.
3/ Wash and iron your own clothes.
4/ Don't eat too much candy.
5/ Wash your hands before meals.
6/ Don't worry about the examination.
7/ Tidy your room every day.
8/ Don't forget to write to your parents.
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