Final answer:
The correct word to complete the sentence 'Grandma is coming on the ______ to visit us.' is 'plane'. It's the only option that represents a mode of transportation suitable for the context of the sentence.
Step-by-step explanation:
To complete the sentence 'Grandma is coming on the ______ to visit us.', the correct word is 'plane'. Grammatically, we need a noun that can be used as a mode of transportation, and among the options provided, 'plane' is the only one that fits. So, the complete sentence is: 'Grandma is coming on the plane to visit us.'
This choice is supported by the context provided where the grandmother appears to be traveling from a distant place to visit, which typically would involve flying on a plane. Unlike 'wood', 'waist', or 'tail', 'plane' is a means of air travel and aligns with the action of visiting from afar.