Tom, Bill and Dave lost their backpacks( 背包 ). They are at the Lost and Found desk. The backpacks are the same, but the things in them are d i fferent. Can you help them find the right backpack? Tom: I have a math book and a pencil case in my backpack. There are three pencils, a pen and an eraser in the pencil case. Bill: I have a Chinese dictionary, a math book and two notebooks in my backpack. Dave: There are two CDs, three picture books in my backpack. My English book is also in it. 2. Which of the f o llowing( 下面 ) is in Tom’s backpack?