Blue whales are . We should try to protect them.( )
A.in timeB.in publicC.in danger
--_____ you ever ____ to Beijing? -- Yes, I went there last year.
---Isn’t the trip boring? --- . I’d like to sleep at home instead of going out.
-____you ever ____with a group? -Yes, I have .
---_______ he _______ from Beijing? ---No, he _______.
------ __ does your father go to see your grandmother ? ------Once a month .