一辆汽车在高速公路上以30m/s的速度匀速行驶，由于在前方出现险情，司机采取紧急刹车，刹车时加速度的大小为 5m/s2，求：
(____)（1）A. first B.second C. three
(____)（2）A. classroom B.play C. playground
(____)（3）A. heavy B. high C. school
(____)（4）A. on B.in C. me
(____)（5）A.floor B. push C. swing
My father, Mr. White, often __________ at six twenty in the morning.
