The researchers found clear and convincing evidence ________ happiness is the key when it comes to better health and longer lives.
.Every time I express an opinion, he always argues ____ me ____ it.
I won’t give you any help ___ you tell me the truth. It’s none of my business.
-- _____? --- He is kind but sometimes a little silly.
Generally speaking, it is about ____ on the mountain than in the valley.
She bought the ring for ¥5000 three years ago, but now is it worth ____ the amount.