He never to his sister.
______the bones under the sand,the scientists concluded that they came from the dinosaurs about 65 million years ago.
She is a quiet girl at school,but sometimes she _____be very naughty.
Shy people often avoid situations _____would force them into close contact with other people.
-----How long do you think it will be _____man can finally solve the problem of cancer?------Well.it depends.
I listened to a report about the Diaoyu Island Dispute last weekend and that was the first time I about the subject.