为探究声音的反射与吸收特点，小明同学进行了实验探究。

分解因式：（x+2）（x+4）+x²﹣4=____．

—What do you think of the film named Let the bullets fly(让子弹飞)?
—I have no idea, because I _____ it. 

    Mike is a middle school student. He goes to school from Monday to Friday. His home is about 5 miles from school. He usually walks to school. It takes him 30 minutes to walk there. Nancy's home is a little farther. It's 20 miles from school. So she often takes the school bus. It takes her 15 minutes to get to school. Bob lives outside the city. It's a town 30 miles away from his school. He takes the subway. It takes him 8 minutes to get to school by subway. He can have breakfast at home and then leave for the subway station. He studies very hard.