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.