—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
They are similar___appearance, but differ_character
The purpose of the article is to draw public attention ______ the problem.
Knowing what colors look good _______ your skin is of great importance when you buy clothes.
(2014届山东省济宁市曲阜师大附中高三上学期期中考试英语试卷) Some modem paintings are _____ my understanding; I simply can't understand what the painters really want to tell us.
David was always ______ his best in any danger, but at that moment he froze.