Final answer:
In this English question, the student is required to choose the correct item for each given sentence or situation.
Step-by-step explanation:
1. The correct item is vital. Good physical condition and careful preparation are of vital importance in mountain climbing.
2. The correct item is expert. John has tried many outdoor activities, but he is an expert at windsurfing.
3. The correct item is steep. Tom was skiing down a steep slope when he hit a tree and broke his arm.
4. The correct item is crop. If it doesn't rain soon, there will not be enough water to make the crops grow.
5. The correct item is located. The firefighters located the missing children after searching for hours in the forest.
6. The correct item is disasters. People will always refer to the tsunami in Thailand as one of the world's worst natural disasters.
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