You can depend on him to rise to the occasion, if need be.

如果需要的话，你可依靠他来应付这个局面。

I can't rise to the occasion.

我根本无法振作起来。

Can you rise to the occasion?

你能在这场合出现么？

You can't rise to the occasion.

你基础无法振作起来。

I would rise to the occasion.

我会逐渐适应情况的。