The most appropriate option to fill in the blank is:or
The sentence should be: "We must start now or it will be too late."
Explanation:
- "Or" is a coordinating conjunction used to connect two alternatives or choices.
- In this sentence, the use of "or" suggests that the speaker is presenting a choice: either start now or face the consequence of it being too late.
- Therefore, "or" is the correct choice to fill in the blank.
- "Until" suggests waiting until a certain point in time, which isn't the intention here. We need to start now to avoid something happening.
- "Unless" introduces a condition. The sentence implies a negative consequence if we don't start now, so "unless" could be grammatically correct, but "or" is more natural.
- "Or" sets up an alternative. We either start now, or it will be too late. This conveys the urgency of starting immediately.
- "But" can introduce a contrast, but it's not the strongest choice here. "Or" creates a clearer cause-and-effect relationship between not starting now and the negative outcome.
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