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III. Find and correct mistake in each following sentence
16. When he was young, he used to helping the poor.
B
C
A
D
17. We had a gardener to plant some trees yesterday.
A
B
C
D
18. Although he doesn't trust weather forecasts, but he likes watching them.
A
B
C
D
19. This is the second time I took part in the rice cooking contest.
A
B
C
D
20. I think it had be better if we use banana leaves instead of paper to wrap food.
B
D
A
C