---I stayed at a hotel while in New York.---Oh, did you? You ________ with Barbara.

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

---Never touch my computer while I’m away． --- Sorry,  __________.

My cell-phone  has disappeared. Who       have taken it away?

I ______ tell you with certainty that he won’t be able to finish it before the deadline.