I thought it was a free gift which

I thought it was a free gift which is of no use to me. So I threw it away.

Results (Chinese) 1:

我认为这是一个免费的礼物，是对我没有用的。所以，我把它扔了。

Results (Chinese) 2:

我认为这是一个免费的礼物，这对我没有任何用。所以我把它扔掉了

Results (Chinese) 3:

我以为这是免费的礼物，对我没用。所以我把它扔掉了。