题目

Jack was so excited about getting a new backpack because his old one had a broken zipper(拉链) and a hole in the bottom. Jack’s elder brother took him to buy a new backpack. There were so many cool ones. How would he ever decide? He saw blue ones—his favorite color. He saw ones with his favorite action hero on the front. And then Jack saw a backpack with a black square design. When he opened it, he saw it had a hidden, secret small bag. He liked it, which made it different from others. “This is the one,” he said, then carried it to the check-out counter. That evening, Jack car在□里填上合适的数. 10－□=7