---What are you going to do next weekend?---I _____ yet. Do you have any good ideas?
I spent five yuan on this pen. =" I" spent five yuan buying this pen.
Why don’t you come and have a look?
Mike likes to watch the birds _________ in the sky.
I am not sure.
---How can I get to the post office?---Walk this road, turn left the third crossing. It’s the right.