—Sorry, sir. I made a mistake again.—____________. Practice more and you will do better.A. I’m not sure.B. Never mind.C. Don’t mention it.
--How many students are there in the classroom? --___________.
Sandy spent too much time _________ computer games.
Please _____ who broke the window.
I enjoy learning English, it takes me a lot of time.
There used a tree in front of the house, but now it is cut down.