某物体从静止开始做匀加速直线运动，则物体在1s末，2s末，3s末的速度之比为______，第1s内，第2s内，第3s内的位移之比为______．

It’s said that there are plenty of hotels in that town. There _____ be any difficulty for you to find one to stay in.

A．mustn’t

B．oughtn’t

C．needn’t

D．shouldn’t