用what(a/an),how填空

用what(a/an),how填空
_____nice ham!Could I eat some more?
_____interesting story!I want to read it once more.
______ nice the flowers is!
______milk it is!
A.How nice B.What nice
用can,could,cannot,couldn't填空
It will be very hot tomorrow ,so we ______wear shorts.
介词填空
When his parents are _______ work,the little boy is in the house.
Keep the medicine ________ _________ the children.