_____ are the twins arguing about with Lily?
—Whenever you have any trouble, you can call me.—Of course, thank you.
— Pudong Airport, please. I have to be there by 7:00.— ______________, but I'll do my best.
It is difficult for us to learn a lesson in life we’ve in fact had that lesson.
I want to _________ at the meeting, but in the end I _________ nothing.
She got up to get some sleeping pills but found there was _________ left at home.