人命关天，现在可不是儿戏的时候。

With someone's life in danger, this is no time to ___play ___games.

威胁是真实的；罪犯显然不是在开玩笑。

The threats were real; the criminals clearly were not ___playing ___games.

别耍花招了，给我们一个认真的出价。

Stop ___playing ___games and give us a serious offer.