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1. You won't regret putting effort into this - it's the best advice I can give you. BETTER

2. Helen wanted to call for a taxi but I explained to her that it was only a five-minutes' walk. NEED

3. You didn't ask for the exact address and now we don't know where to go. OUGHT

4. It wasn't a good idea to give him my contact details. SHOULD

5. I fed the cat after I got back from school in the evening. I didn't know that my sister had fed it thirty minutes earlier. HAVE