He used to cause a lot of trouble.文中的空怎么填

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He used to cause a lot of trouble.文中的空怎么填

(1)after his father's death a few years ago
(2)and didn't give up trying to help him
(3)Even the teachet agreed that Martin was wasting his time
(4)That's when I decided to change

他过去制造了很多麻烦。

空在哪里?