[问答题]用适当的介词填空，可重复使用。 in, on, for, of, under, between , at, behind .Thanks __your nice pictures. 2.Here is the photo __my family. 3.Listen! The birds are singing __the tree. 4.We are eating dinner __the table. 5.Look __ the blackboard, please. .The drawer is__ the bed and the bookcase. 7.Please put your books __ the backpack. 8.The boys are playing __the tree. 9.—Where is Lily? —Oh! She39s __the door. . What39s this __ English?