按要求完成下列各句。 1. It's an old box.(改为一般疑问名) _______ _______an old box? 2. It's an English car.(改为复数形式) _______ _______English_______ . 3. These are rulers.( 用erasers改为选择疑问句) _______these rulers_______ erasers? 4. I'm in Class 5 .(划线部分提问) _______class_______ _______ in? 5. Li Lei is thirteen .(划线部分提问) _______ _______is Li Lei?