Definition: something that you are certain will happen Level: C2
以他目前的状态，入选首发阵容是十拿九稳的事。
In this form, he's ___a ___safe ___bet for the starting lineup.
黑色对于正式场合来说总是一个稳妥的选择。
Black is always ___a ___safe ___bet for formal events.
投资可再生能源似乎是未来一个稳赚不赔的选择。
Investing in renewable energy seems like ___a ___safe ___bet for the future.
