[Q]: Objective: If you download a PDF file and it's an exe file
[A]: delete it, it's a virus

[Q]: Objective: wrench
[A]: can break the glass

[Q]: Objective: To clean a laptop screen effectively.
[A]: Use a tissue paper to wipe the laptop screen.

[Q]: Objective: To get rid of fruit flies naturally.
[A]:
Fill a bowl with apple cider vinegar and a bit of soap. The vinegar will attract them and the soap will kill them.