Have you ever heard of Langlang—Sure. He is one of ______ pianists ______ I have even seen.

Whose Chinese vase is it?— I have no idea, but I’m pretty sure it _______ the old lady.

The producer comes regularly to collect the cameras________to our shop for quality problems.

Mary is tired of learning because she is always ______ to do better than she can , both at school and at home.

What he had said and done in the school ______ his parents and teachers.