Try to be careful. The ________you read, the fewer mistakes you will make.

How many people will come to Beijing for the Olympic Games in 2008? — It’s hard to say. _______ people, I think.

My dad __________ Singapore for a meeting. He ________ there twice.

Hefei is a beautiful city, isn’t it?—Yes. There are about two ____ visitors here week.

When shall we start?—Let’s _______ it 8:30.Is that all right?