考虑到目前销售如此缓慢，我认为这些销售预测是不切实际的。

I think these sales forecasts are ___unrealistic, considering how slow sales are at present.

期望在下周之前得到答复是不切实际的。

It's ___unrealistic to expect an answer before next week.

有人可能建议放生所有动物，但我意识到这个想法是不切实际的。

Some may suggest releasing all the animals, but I realise that idea is ___unrealistic.