---It is reported that a Boeing 777-200 plane became lost in communication (失去联系) at midnight __________ the early morning of March 8th.---I was amazed to hear that.
-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.