题目内容：

People are being lured(引诱) onto Facebook with the promise of a fun, free service, 1. realizing that they're paying for it by giving up plenty of personal information. Facebook then attempts to make money by selling their data to advertisers that want to send2. (target) messages.

Most Facebook users don’t realize this is happening. Even if they know what the company is up to, they still have no idea 3. they’re paying for Facebook, because people don’t really know what their personal details are worth.

The biggest problem, however, is that the company keeps changing the rules.  Early on, you could keep everything private. That was the great thing about Facebook -- you could create your own little private network. Last year, the company changed its privacy rules 4. many things -- your city, your photo, your friends’ names -- were set, by default(默认), to be shared with everyone on the Internet.

According to Facebook’s vice president Elliot Schrage, the company is simply making changes to improve its service, and if people don’t share information, they have a “5. (satisfying) experience.”

Some critics think this is more about Facebook looking to make more money. Its original business model, 6. involved selling ads and putting them at the side of the page, totally failed. Who wants to look at ads when they are connecting with their friends online?

So far the privacy issue 7. (land) Facebook in hot water in Washington. In April, Senator Charles Schumer called on Facebook to change its privacy policy.  He also urged the Commission to set regulations for social-networking sites.

I suspect that whatever Facebook has done 8. (invade) our privacy is only the beginning, which is why I’m considering 9. (cancel) my account.  Facebook is a handy site, but I’m upset by the idea that 10. information is in the hands of people I don’t trust. That is too high a price to pay.