我们砍倒了那棵老苹果树。

We ___chopped ___down the old apple tree.

当局决定砍倒那棵危险的树。

Authorities decided to ___chop ___down the dangerous tree.

他不得不砍掉枯枝以防事故发生。

He had to ___chop the dead branches ___down to prevent accidents.