Mr. Crossett was made __________ his experiment because of his poor health and old age.
. It's very kind ______ you ______ say so.
The old man's ______ pity on the snake led to his own death.
It is no good ______ today's work for tomorrow.
It's no use______ with him. You might as well ______ with a stone wall.
I couldn't understand ______ at the poor child.