Professor Lee failed many times but he ________found a good way to solve the problem.

The Internet has brought _____ big changes in the way we work．

It is reported that ________ 8,000 torchbearers will take part in the London Olympic Torch Relay. 

—I heard Charlotte had been drowned in the lake.—Really！Her boat turned______,and ______she couldn’t swim.

30．---- Do you think it's a good idea to make friends with your students?---- _____ , I do. I think it's a great idea.