— What should we do to prevent the flu?—We should keep our rooms_____ and the air fresh all the time.A. cleaning B. cleaned C. clean
How __ the weather ___ last Sunday?
This morning when I walked by the park, I saw many children ___ there.
There ____ a sports meet in our school. I will take part in the long jump.
I think this is ___ useful book, so I will keep it for ever.
Peter is a _______boy. His younger brother is _______.