Every day ________ a proverb aloud several times until you have it memorized.
Class is over.—Look, _________ number of students are playing football there. Let’s go and join them.
Can you tell me ________? — With Lucy’s help.
Look at that girl! Is it Susan? –No, it _______ be her. She went to her hometown just now.
Why would some workers in Foxcon die _____ continue working in the factory? — Psychologists say they are under too much pressure. [ ]