I think it’s to fasten firmly. After the word secure it says “or attach”.
The sentence should be placed after sentence 4. The following sentence is a conclusion, as it sums everything up.
The second one, and the last one
Answer:
One way you could be a better student, or human-being in general is to wear your mask at all times, aside from eating, of course. The other way, which you should be doing both, is to social distance as much as possible. If you do, however come in contact with people or objects, wash your hands thoroughly with soap and water.
