When H7N9 bird flu first appeared, people didn’t know_______ doctors could cure it.

Tommy, do the dishes.—Mum, it’s a girl’s job. I would rather________the floor.[ ]

I will take an important test tomorrow. —Oh, really _______!

He asked me if I________ mad _______him.

I can’t find Mary. Where is she—Sorry, I don’t know ____ .