D Look, choose and write

in on by under behind
Class is over. Bobby and Sam play outside. Sam is
the table. Bobby is the tree.
Sam: Is that your book, Bobby? It's the table.
Bobby: Yes, it is. Thank you.
Sam: Oh, that is my schoolbag! It's the table.
Bobby: Look! A ball is the flowers. Where's my
paper plane?
Sam: Ha ha! It's the tree.
Bobby: Ah! A bird is the tree too.

by; behind; on; under; under; in; in

本题考查介词in, on, by, under, behind的词义和用法，结合图片场景理解：
1. by表示“在……旁边”，Sam在桌子旁，所以第一个空填by；
2. behind表示“在……后面”，Bobby在树的后面，所以第二个空填behind；
3. on表示“在……上面”，书在桌子上方，所以第三个空填on；
4. under表示“在……下面”，书包在桌子下方，所以第四个空填under；
5. under表示“在……下面”，球在花丛下方，所以第五个空填under；
6. in用于表示外来物“在树里/树上”，纸飞机是外来物，所以第六个空填in；
7. in用于表示外来物“在树里/树上”，鸟是外来物，所以第七个空填in。