—Jack,do you know ________?—Sorry,I don’t know.
It’s important for us to keep food __________in the fridge, especially in summer.
-We have 7 people here , but the car only has 5 seats. -I think we need to solve this __________now.
Her son began to play __________piano when he was only three. Now he’s very good at it .
—I'm sorry to keep you waiting for me so long. —.
—I want to knowthe day after tomorrow? —Ask Jim. He must know.