You won’t pass the English exam ___________ you study hard.A. if B. so C. unless
—How many ______ are there in your school? —There are twenty-one.
—What _______ animals do you like? —I like koalas.
________ people________ walking along the beach.
_________ great fun it is to go boating in such fine weather !
—like the cat? —Because she’s kind of boring and she’s lazy.