Is Medicine a science?　 —Well, nowadays, most doctors recognize that medicine is ____ it is a science.　　

has reported a second case of a new type ofvirus infection. The virus is similar to ______ that caused SARS, a breathing diseasethat killed 775 people in 2003.

Hello! Nice to meet you. ________ my friend, John.

（题文）The Mp3 ________ young people ________ a bit of decline recently with the appearance of the Mp4.

On my mother‵s birthday ,my family got together for _____big dinner. We were happy.