(12)Six silly sisters sell silk to six sickly senior citizens.
(13)Ten tiny tortoises tried to talk to twenty timid toads.
(14)How many cuckoos could a good cook cook if a cook could cook cuckoos?
(15)Three thumping tigers are tickling trout.
(16)Sheep shouldn't sleep in shaky shacks, should they?
(17)A spoiled boy destroyed a toy for joy.
(18)Nick had a big pig with thick sticky skin.
(19)Cat, cat, catch that fat rat!
(20)Some say sweet-scented shaving soap soothes sore skin.