Question

1. How thick must the ice be for the Eleven Cities Tour?

2. How thick must the ice be to hold the Eleven Cities Tour?

3. How thick must the ice be so that the Eleven Cities Tour take place?

- The ice must be at least 15 centimeters thick.

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What is the suitable question for the answer? Do you have some more better questions?
Ms. Sue
1 is the best.

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