求高手解决英语问题：1.The boy is hiding ______(on,behind) the house.选一个单词填空（求原因）

求高手解决英语问题：1.The boy is hiding ______(on,behind) the house.选一个单词填空（求原因）
2.选择：Here's my pen.I () it,and I finally () it.（请说明原因）
A.am looking for/find
B.am looking for/look for
C.am finding/find
D.am finding/look for