China__ send people into space before, but now we can.. A. can’t B. couldn’t C. may not
We need to __________a plan about what to do on Clean-up Day.
They were _________ when they heard the _______ news.
Beijing is one of the ____ in the world today.
In our class some students are too shy to __________ our hands when the teachers ask us to answer questions.
If it _____________ tomorrow, we’ll have a picnic.