Check correct or not

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Dear student,
1, and 2 are correct
3 is blurry and cannot be read clearly
4. is correct
5. and 6. are correct
8., 9. and 10. are correct
11. We must comply with the orders of our superiors.
12. He has been absenting himself from the class for a week.
Kindly post the rest of the queries in another thread for assistance.

Regards