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1. The Pacific Ocean is on average deeper than the Atlantic.
The average . 

2. Sarah is better at chemistry than Susan.
Susan isn′t . 

3. It was a pure chance that a policeman was passing as I was attacked.
Only . 

4. The students regretted that they had missed the lecture.
The students regretted not . 

5. You can leave only when I tell you.
Until .