考虑到目前销售如此缓慢，我认为这些销售预测是不现实的。

I think these sales forecasts are ___unrealistic, considering how slow sales are right now.

期望在下周之前得到答复是不现实的。

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

但认为每个人都能骑自行车上班是不现实的。

But it is ___unrealistic to think that everyone can go to work by bicycle.