Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
______ you are, _____ mistakes you’ll make.
—— Don’t play with fire.——-_________
This piece of music ____ him ____ one of the most popular singers.
The text is ______ easier and ________ interesting than that one.
Kate is my good friend. She often ____ a smile ___ her face .