Have you ever _______ with a group?
A:to speak
B:study
C:studying
D:studied
根据首字母提示完成下列短文。
A good class monitor gets on well w____ classmates and likes to h____ others. He often cleans the classroom and makes the classroom c____ just like h____. C____ him to be your monitor.
下列对铁的性质的描述中,属于化学性质的是()