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用括号里所给的正确形式填空。 1. Those toys_____(make) of plastic. 2. There were a lot of great_____(invent) in the 20th century. 3. We should make up our mind to improve our listening, speaking, Reading and Writing _____(able). 4. There's but one China and Tai wan is _____(part) China. 5. _____ it was so cold ,he went out without an overcoat.