Mr Smith was driving fast to take his wife to the nearest hospital because their baby was.

问题补充：

Mr Smith was driving fast to take his wife to the nearest hospital because their baby was.

A. on its way

B. in the way

C. by the way

D. out of the way

答案：

A. on its way

B. in the way

C. by the way

D. out of the way

解析：题意：史密斯先生驾车飞奔送他的妻子去最近的医院，因为他们的孩子快要出生了。 on one’s / the way 意为“在路上、在来或去的过程中”，此处可理解为“快要出世了”。