用适当的介词填空,可重复使用。 in, on, for, of, under, between , at, behind 1.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. 6. 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! She's ______the door. 10. What's this ______ English?