When I got into the classroom, I found a book ______ on the floor.
He cut off half his right arm______ a knife ______the dangerous situation.
---What are you going to do this weekend?-----I’m going to help _____the city parks with my classmates to make them clean.
I have a______, so the doctor told me to drink lots of water.
---Mum, I cut myself just now. ----You ______put some medicine on it.
_______everyone is here. Let’s start our meeting.