clear away, clear up, clear off
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
