21.— Who is _______ girl in red?
— She is Mr. Smith’s daughter.
A. an B. the C. a D.不填
22.We will go on an outing tomorrow _______ it doesn’t rain.
A. until B. while C. unless D. if
23.Practice more, _______ you will learn English better.
A. or B. yet C. and D. but
24.I invited Joe and Linda to dinner, but _______ of them came.
A. neither B. either C. none D. both
