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It seems like you're asking for the correct prepositions to complete the given sentences. 1. Look for 1 hour - 3 days Look for 3 days, but I need only 1 hour. 2. take the train for thirty minutes - 2 days take the train for 2 days, but I need only thirty minutes. 3. go by bus for twenty minutes - 1 day go by bus for 1 day, but I need only twenty minutes. 4. go by bus for fifteen minutes - 1 day go by bus for 1 day, but I need only fifteen minutes. Alternatively, you could use the preposition "of" and rephrase the sentences as follows: 1. need a look of 1 hour - 3 days need 3 days, but only a look of 1 hour. 2. take a train of thirty minutes - 2 days take 2 days, but only a train of thirty minutes. However, these sentences seem less natural. The best option is to use the correct prepositions ("for" or "of") and rephrase the sentences for better clarity: 1. I need to look for 1 hour, but I have 3 days. 2. I need to take the train for 30 minutes, but I have 2 days. 3. I need to go by bus for 20 minutes, but I have 1 day. 4. I need to go by bus for 15 minutes, but I have 1 day.