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Fill in the blank with proper answer We cannot ......... that our flights will never be delayed.
- spend
- estimate
- follow
- create
I think the answer is "estimate" but in the book in which I found this question, the answer is "spend". It said that in this question, it means guarantee (or assure). I think it doesn't make any sense. So, what is the right answer? Why?
The word spend does not mean "guarantee" or "assure" in modern English, and I can find no dictionary referring to this as an obsolete meaning.
The book is wrong. None of the suggested words would be appropriate in the gap for a reasonable meaning.
