perplexed GRE

I am perplexed to know what to do.

做才好。

He perplexed me with this problem.

他用这个问题难住了。

He was still more perplexed, for this inconsequent smile made nothing clear.

他依然更加感到困惑，因为这突如其来的一笑，使他感到莫名其妙。

The professor is never at a nonplus, and never perplexed by a problem.

那位教授从来会感到困惑，也会被任何问题所难倒。

The farmer felt the cow,went away,returned,sorely perplexed,always afraid of being cheated.

那农民摸摸那头牛,走了又回来,犹豫决,总怕上当受骗。

Gary looked rather perplexed.

加里看起来相当困惑。