clear away表示“清除掉”、“收拾掉”、“散掉”、“消散”;clear up表示“露出(喜色)”、“(天气)放晴”、“清理”、“整理”;clear off表示“走开”、“离开”。

　　[EXERCISES]

　　1) We must ____ such ideas among ourselves. 2) She ____ her desk before she moved to another school. 3) The sky looks as if it would ____ soon. 4) ____ before I call the police. 5) His face ____ when he read the letter. Key: 1) clear away 2) cleared up 3) clear up 4) Clear off 5) cleared up