我在跳蚤市场买了一张二手桌子。

I bought a ___secondhand table at the flea market.

那个无家可归的老人曾是社会的弃儿。

The homeless old man was once a ___cast-off of society.

钓鱼时，他轻轻一甩就把鱼线抛了出去。

When fishing, he gently ___cast off the fishing line into the water.