题目

现有8种物质：①洁净空气②铜丝③冰水混合物④液氧⑤澄清石灰水⑥高锰酸钾⑦矿泉水⑧四氧化三铁。     其中属于混合物的是                 (填序号，下同)；属于氧化物的是            ； 属于含氧元素的化合物，但不属于氧化物             ；属于单质的是                ； 含有氧分子的是                  。 根据句意及首字母提示补全单词。 1．My family is very poor, so I can’t a____the price of 100,000 yuan for a piano. 2．We are d______how often we do different activities. 3．He p______speaking English every day. 4．His grandfather r________when he was 60. 5．Last week’s talent show was great s_______.