惠勒入选球队是十拿九稳的事。

Wheeler is ___a ___safe ___bet for a place on the team.

我们自然而然地认为黑色是任何场合的稳妥选择。

We automatically think that black is ___a ___safe ___bet for any occasion.

鉴于他一贯的表现，他的晋升是板上钉钉的。

Given his consistent performance, his promotion is ___a ___safe ___bet.