根据句意及首字母提示完成单词。
1.—Where's my baseball?
—It's on the f___________, under the table.
2. Please put the desk b___________ the sofa and the dresser.
3.—Where is my c___________?
—It's under the table.
4.—W___________ is my backpack?
—It's on the sofa.
5.—Where are my books?
—I don't k___________.