Ⅰ.语境填词
1．________ (水蒸气) has fogged the bathroom mirror.
2．The empty boat was ________ (漂浮) on the sea.
3．His research ______ (形成) the basis of his new book.
4．In what way is a laboratory balance different from a ________ (天平) found in a store?
5．The candle ________ (火焰) flickered and went out.
