When ___C__,metal will expand.(讲解一下)

谁能帮我讲解一下when,while,as? When metal becomes hot,it() water _______（expand) when it is heated.填expand什么形式,为什么, I will never do that again帮忙讲解一下never 请讲解一下will 做为情态动词的用法 Substances will expand or contract()heated or cooled,but thi substances will expand or contract__heated or cooled,but thi when does an object expand?.when it is cold B.when it is hot 一道英语试题,求讲解-Jack,could you help me ____ when the plane will t matlab When a metal sphere at constant initialtemperature is when和while有什么区别,可以举几个例子讲解一下吗? 高手讲解一下这道题,谢谢了.It will take _______ time to finish the work