–Can I park my car here?–No, look at the sign.Which sign does the second speaker refer to(指)?
Don’t________trees and we should love nature（自然）．
—________do they go to the zoo？ —Because they want to see pandas．
Let’s________for a walk，shall we？
Maria is a________girl．She always smiles and says hello to others．
Please________quiet．Let’s have a meeting．
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