Tom’s mother asked him _________ some washing after dinner.

Can you tell me ______ it is from here to the Summer Palace —Let me see. It’s about 15 minutes’ ride.

下列各句中，划线的成语使用恰当的一句是（）

Alison, I’m sorry. I can’t come to the wedding with you tomorrow morning. — ________? — My grandma was severely ill, so I have to stay in the hospital to look after her.

City air is very dirty， so it would be wise ______ you to wash your hair often.— I know， but it is not easy ______ me to do that every day.