根据汉语意思完成英语句子
1. “书包在哪儿?”
“在桌子下面。”
—_________ the schoolbag?
—It's ________ the table.
2. “地图在哪儿?”
“我认为在你爷爷奶奶的房间。”
— ________ the map?
—I think it's _____ your ________________room.
3. “你的书在哪儿?”
“它们在椅子上。”
—________ _______ your books?
—They are ______ the chair.
4. 钥匙在书架上。
The keys _______ _______ the bookcase.