--Are you sure to help me find____________ bed for my new house?

--Of course, but not now. I'm heading, for____________ bed and a good sleep.

A．a,a

B．a,不填

C．the,a

D．a, the

乘坐公共汽车，当身体突然向前倾倒时，说明此时汽车正在________；当身体突然向右倾倒时，说明此时汽车正在_________。