谁

shéi who; also pr. [shui2]

笑

xiào old variant of 笑[xiao4]

xiào laugh; smile; CL:個|个[ge4]

在

zài (located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)

最后

zuì hòu final; last; finally; ultimate

， 谁

shéi who; also pr. [shui2]

笑

xiào old variant of 笑[xiao4]

xiào laugh; smile; CL:個|个[ge4]

得

de structural particle: used after a verb (or adjective as main verb), linking it to following phrase indicating effect, degree, possibility etc

dé to obtain; to get; to gain; to catch (a disease); proper; suitable; proud; contented; to allow; to permit; ready; finished

děi to have to; must; ought to; to need to

最好

zuì hǎo best; (you) had better (do what we suggest)