Let’s go to the ______ to study for the exam.
-Ann is in hospital. -Oh, really? I_______ know. I_______ her for a long time.
It_______ ten years since Professor Du last_______ to the earth.
Mike's father_______ to London last month. He_______ there three times.
He used ____on the right in China, but he soon was used____on the left in England.
--- Do you mind if I take the seat next to yours?--- ______________. It hasn’t been taken yet.