1. the secretary signed the letter (in/on/at) behalf of her boss.
2. you must study this paragraph (by/in/at) detail.
3. why can't you look at the problem (in/to/from) my point of
view.
4. we need sales people who can work (on/at/by) their own initiative.
5. harry managed to sell his house (on/in/at) a very high price.​

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