Tom’s mother is busy _____ breakfast for Tom.

    One of the few things you ______ say about English people with certainty is that they talk a lot about the weather. 

 Don’t be angry with us. We _____ with you together, but we were busy with our final reports when you called in.

The company is quite honest and guarantees the new product ______ be under warranty for three years.

 —Look! A book is on the floor. Whose is it?—It ______be Rick's. It has his name on it.