Conversational yet professional tone

 

1. Your vacation request was approved.

 

2. Please adhere to the signs and wash your hands thoroughly!

 

3. All employees are herewith instructed to return the appropriately designated contracts to the undersigned.

 

4. Regarding your order, we must confirm the sizes before sending it to our shipper.

 

5. Please return your contracts to me.

 

6. Employees were not aware of negative consequences of using these perilous chemicals.

 

(6.2 Employees have not been made sufficiently aware of the potential adverse consequences regarding the use of these perilous chemicals.)

 

7. We simplified the item production process and tested it.

 

8. It is tricky to calculate exact timing for minimizing risks.

 

Revising for conciseness

 

9. Prior starting the week, students organized their agendas by including updated due dates.

 

10. Because the exams are coming, students should review their lectures and study grammar fundamentals

 

 

PLEASE CORRECT IT IF THIS SENTENCE ARE NOT IN THE APPROPRIATE TONE AS INDICATED IN THE BOLD WORD?