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用括号中所给词的正确形式填空。 1. —Where is the bird? —It ________ (fly) away a moment ago. 2. He is worried about _________ (not pass) the English exam. 3. Amy would rather ___________ (wear) green than red. Red is a girl's color. 4. He told me that he would have some difficulty (chat) with American students. 5. It is generous of the people from the rich family_________ (donate) to UNICEF. 6. — Hi, Liu Tao. I didn't see you at the party. —Oh. I _______ (get) ready for the maths exam.