I've correct these sentence, chosen the word I'd use, help please

Could you please tell me how you would say these?



- I’ll have an excuse to do less work/for doing less work. FOR

- I gave him an excuse, that way when I’ve got nothing to show for my day, I’ll blame it on the computer.

- Today’s going to be/will be a long day. BOTH

- You’re lucky be surrounded with/by such nice people. BY

- I find it easier this way/like this. BOTH

- I thought you had the same job/position. BOTH

- I don’t see where the skin irritation could have come from./see how my skin could be irritated.

- If you are calling about/regarding the ad, its no longer available.



Thank you