8．　 How can such a large quantity of knowledge be ________ (获得)？

7．　 A cough and a fever are usually ________(症状)of a bad cold.

6．　 Your feet are ________(肿的). You must go to see a doctor.

5．　 H________ medicines have been used in China for thousands of years.

4．　 Biggest doesn’t n________ mean best. Many rich countries are very small, while some big countries are not rich.

3．　 Before the invention of aspirin, coffee was once used as a p________.

2.　　 Afraid of the nuclear leak, they’ve spent a large sum of money to fit every room with systems that p________ the air and water.

1.　　 Martin Luther King’s speech was so exciting that the audience rose to a________.

3.　　 Some experts say that spending too much time building Internet ________ can ________ people’s abilities to live normal lives… This study clearly shows that people who spend all their time on the Internet can feel ________ from the people and the world round them.

2.　　 Young people from different ________ and different countries can form lifelong friendships. ________, people who are disabled and must stay in their homes can communicate with the outside world and meet others with ________ interests.