题目

用括号内所给单词的适当形式填空。 1.It’s ________ (believable)that the little girl won the singing competition. 2.Are you completely_______ (truth)with me? 3.Who is the_______ (own)of the schoolbag? 4.Alice gave up the English exam because of her ________ (ill). 5.He volunteers his weekend ______ (help)people in need. 答案：1.unbelievable  2.truthful 3.owner 2.illness  5.to help19．下列对实验现象描述正确的是（　　）A．铁丝在氧气中燃烧生成黑色的四氧化三铁B．木炭在空气中燃烧发出白光C．蜡烛在氧气中燃烧时，产生水和二氧化碳D．氢氧化钠溶液能使酚酞试液变红