根据所给汉语和单词首字母提示，写出下列英语句子空白处所缺单词的正确形式。（每空一词）
If we work ____________(独立地)，we can learn much more.
The old farmer is always_____(精力充沛的)as if he never knew tiredness.
It is not easy to educate ______(少年).
The speaker failed to explain his ideas clearly enough , which caused the ___(误解).
To read an emoticon, you have to look at it __________(斜着地).
My mother watched until my sister’s train d____________ from her sight.
I can’t a________ to relax because I am busy preparing for an important exam.
Water exists as a solid, a l_______ and a gas.
I’m f___________ of walking home alone in the dark.
The experiment shows us how iron r_______ with air and with water.