I gave her ________ usual advice, but she thought it was _________ useless answer.

bargaining is so interesting—Sometimes it is a test to see who can stand their ground for the longest.

I’ll give you my friend’s home address______ I can be reached most evenings[ ]

下列各句中划线的成语使用恰当的一句是（ ）

people have always been curious ______ how living things on the earth exactly began