Alice is years old. Today is her birthday.

. It’s illegal for anyone under 21 in the USA, the highest drinking age in the world to buy alcohol, and stores or restaurants caughtalcohol to people under the legal age will involvetheir licenses.

下列各句中，加点的成语使用恰当的一项是(3分）

Have you ever written a letter to yourfriend—Yes, I.

Could I watch TV, mum I want to have a rest.—No，you _______. You must finish your homework first.