16#2011693My bicycle's ____ tyres are flat since I haven't pumped ____ air for a long time. Aneither / muchBall / someCeither / plenty ofDboth / any

To fill in the blanks with the correct option, we need to consider the context of the sentence and the usage of the words provided.

1. Understanding the Options:

   • A. neither / much: "neither" suggests a negative, which doesn't fit the context. "much air" can be used but is not ideal.
   • B. all / some: "all" is not fitting in this context, and "some air" is appropriate but not strong enough logically.
   • C. either / plenty of: "either" works, but "plenty of air" would imply an abundance, which contrasts with the idea of flat tyres.
   • D. both / any: "both" is appropriate as it's not mentioning specific tyres but generally refers to them, and "any air" logically indicates that there’s a lack of air in the tyres.

2. Choosing the Best Option:

   • The best choice is D. both / any. The completed sentence would read: "My bicycle's both tyres are flat since I haven't pumped any air for a long time."

Final Answer

D. both / any