---I think ______ people drive, ______ air pollution there will be.---That’s true. I hope the air will be fresher soon.
There are ______ floors in the building and my home is on the ______ floor.
— Do you know anything about Chinese knots (中国结)?— Yes. They are usually regarded ______symbols of good luck.
—Do you know ”Chopsticks brothers”?—Sure, I like ______ song “Little Apple” very much.
I want to have ______ English pen pal.
He always speaks to others ________ /pə’laɪtlɪ/, so we all like him.