Look! There is________ bird flying in ________sky.
You needn’t worry ____ about your Maths. Work harder and you will do better.
---It seems that Mr. Wu is standing there.---It ________ be him because he called me from Canada just now.
---Mr Johnson asked me to remind you of the meeting this afternoon. Don’t forget it! ---OK, I _________.
Can you tell me _____?
Please don’t smoke here. The sign _______ “No smoking.”