Is that your model plane? — No, it’s his, is on the sofa.

To be well-informed , we should be ______ communication _____ each other about what happens to us.

The children all looked _____at the broken model plane and felt quite_____.

Look at that girl! Is it Susan? –No, it _______ be her. She went to her hometown just now.

He is an honest boy. I have no reason to _______ what he said.