Sea shells and moon cakes

Yee, tongue twisters!
Try to say:
Which witch wished which wicked whish. (Looks funny, doesn't it?)

Let's take another one:
Sally is a sheet slitter, she slits sheets. (That's an easy one)

Let's try a longer one:
Seven sleazy shysters in sharkskin suits sold sheared sealskins to seasick sailors.

And another longer one:
Sarah, Sarah, sits in her Chevrolet. When she shifts she sips her Schlitz,and when she sips her Schlitz she shifts.

And the last but not least, old classic:
She sells seashells by the seashore. The shells she sells are surely seashells. So if she sells shells on the seashore, I'm sure she sells seashore shells.

NB: one mooncke contain ca. 1000 cal

And after trying all this you can reward yourself with a Chinese mooncake.