It is very merciless _____ you to have _______ the homeless tramp in a worn-out coat when hebegged something to eat.[ ]

_____on the grass _____singing and laughing.

“Trick or treat”means kids will play a trick you if you don’t give them a treat.

He drank up the whole bottle of milk，not even adrop to his little brother．

who pretended,heard, however, every word that was said.