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ll_ __(成年人 )must look after their children well. 15. The leaves_ __(遺留 )in the water for a short time and produced a pleasant smell. 第五課時 (Section B 2a~ 2b) 四 、 從方框中選用合適的單詞 , 并用其適當(dāng)形式填空 。 (5 3分= 15分 ) 16. There are many__ __flowers on the hill in spring. 17. A panda keeper is telling the students about the __ of saving endangered animals. 18. An__ elephant is about 350cm tall. 19. The__ __cars people drive, the_ __pollution there will be. 20. Do you often cook your vegetables with m