由于易被氧化而不宜长期存放的是①高锰酸钾 ②氢硫酸 ③硫酸亚铁溶液 ④硝酸铜溶液 ⑤亚硫酸钠溶液
One of the most important questions they had to consider was _____ of public health.
Encourage your children to try new things, but try not to ___ them too hard.
The computer was used in teaching. As a result, not only__________, but students became more interested in the lessons.
The children all turned ____ the famous actress as she entered the classroom.
Edward, you play so well. But I ______ you played the piano.