—Look! What a nice classroom! — Yes, it ________ every day.A. is cleaning B. has cleaned C. is cleaned
---How long have you been studying at this school? --- I have been studying here____.
Jim didn’t understand ____.
---youthe cat?---Yes, I have. ---Whenyouit? ---Ten minutes ago.
We need friends to ____, or we will feel ____.
Because of Project Hope,_______children have better lives.