Mr. Smith, I often hear people say DVD, but I never know what they really mean. Would you tell me what DVD ____?

Is your ipad white, Mandy —No, it isn’t. _______ is black.

He said, “ Light travels much faster than sound.”— He said that light _______ much faster than sound

said that Chris achieved high grades in the examination.— That’s no surprise. He is______, you know.

On the top of the mountain, you can get a wonderful ______ of the nearby hills. This is the very reason _______we like to go there in our spare time.