Don’t say bad words ______ your friends. It’s ________.

Mr Zhang is always _______ others. He often gives his seats to someone in need.

No matter where he is, he makes ________ a rule to go for a walk before breakfast.

I know the teacher ________ Mary when he spoke of a bright girl

Such a problem is＿＿＿＿difficult for a primary school student ＿＿＿