直接填上得数．

5千米=______米7000千克=______吨

1米-7分米=______分米 5千米+2000米=______千米

9吨-2000千克=______千克 72厘米+28厘米=______米．

— Is your brother afraid of the dark?

— Yes. He always goes to sleep with the bedroom light _________.

A．off

B．in

C．at

D．on