As teenagers of the 21st century, we should be ready to _____ the challenge of society.
______ more attention, the tree could have grown better.
Tom, you _____ leave all your clothes on the floor like this!
We have to work hard, ______ we’ll lose the chance.
---Keep me informed _______ the latest news. ---Ok.
---Are you still going work on foot? ---Yes. My car _______ in the garage.