Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.

That notebook _____  John’s. It has his name on it. 

--- ______ I bring you all the magazines right now?--- No, you don’t have to, but you ______ give them to me tomorrow.

You ______ be hungry already—you had lunch only two hours ago!

—May I use your computer, Mr WU?　　　—______．