Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
Li Ming wants _____ out this evening.
Michael often has _____ rice and fish _____ lunch at school.
—Is Mr. Brown a good teacher?—Yes. He is kind ____ us. We love him.
—Help ____ to the chicken, Tom and Jim.—Thank you.
—What would you like ____?—Some milk, please.