Sixteen-year-olds to watch this kind of movie because it's too scary.[ ]A. should allow B. shou

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• She ________ hum pieces of music at the age of four. She is a talented singer. [ ]A. can B. could C.
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• 在自然界中，树木不断掉落树叶，动物不断地死亡，却不会出现树叶和动物尸体堆积如山的状况，这主要是因为（）A．被雨水冲走B．大雪掩埋C．树叶被风吹跑，动物尸体被秃鹫取食D．分解-生物
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• 用can或can't加下面一个动词填空。 speak, see, hear, play, color, ask, drive, fly, spell, go1.I'm sorry
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