—Can you lend me the book Passing by Your World?
—Sorry. I returned it to the library just now. Maybe it is still ________.
A. available B. possible C. saleable
—Mom, who won the first place in the TV show I' m a singer?
—It ________ be Han Hong, but I' m not sure. Last Friday I missed it.
A. mightB. mustC. should
At school, some students are active ________ some are shy, yet they can be friends with one another.
A. whileB. althoughC. since
The doctor advises us to exercise ________ on hazy (雾霾) days because it may influence our health.
A. more B. less C. better
Thousands of foreigners ________ the World Internet Conference in Wu Town.
A. attended B. accepted C. attracted
In our class, there' s a ________ that when it is somebody' s birthday, they bring in a cake for us all to share.
A. conversationB. traditionC. discussion
