气燃烧器按空气供给方式分有自然通风式、引射式和（）。

A、鼓风式

B、蒸气雾化式

C、引风式

D、燃气雾化式

When the railway is completed, we（）get to town much easily.

A.must

B.would

C.are able to

D.will be able to