题干
根据句意，用所给动词的适当形式填空。
(1)More than one person ____ (clean) the classroom at 6 o'clock yesterday.
(2)The boy has been used to ____ (lie) when he makes a mistake.
(3)It's said the price of food in China ____ (rise) quickly recently.
(4)I tried many ways I could think of____ (stop) the little boy from crying.
(5)Not only the students but also the teacher____ (ask)to go to school on time now.
答案(点此获取答案解析）
was cleaning,lying,has risen,to stop,is asked
量（1~2mL）低浓度（1×10-4mol/L）的酸性高锰酸钾溶液中。据此，下列说法正确的是