补全对话（填入适当的单词）

Tina:   1   was your day off, Tony?

Tony: It   2    terrible! I   3   very hard for my math exam last week, so I   4   late.  Can you believe it?

When I   5   up, it was already 12 o'clock.I got   6   and  went to my friend's house, but he   7   there.

He was at the beach.

Tina: So what    8   you do?

Tony: I helped my mom and dad   9   the yard.

Tina: Sounds like a busy   10    off.

在不能忽略空气阻力的情况下，让一轻一重两石块从同一高度处同时从静止开始下落，则                                                          

A．在落地前的任一时刻，两石块具有相同的速度

B．重的石块下落得快、轻的石块下落得慢

C．两石块在下落过程中的平均速度相等

D．两物块下落时的加速度都是g