[Q]: Objective: To tighten a nut
[A]: Put a spanner on the nut and turn clockwise

[Q]: Objective: How to lock a door from the inside
[A]: Close the door. Turn the knob on the lock in the appropriate direction to lock it. Test the door by twisting the knob and see if it opens.

[Q]: Objective: how do you clean fruit?
[A]: hold it under running cold water and wipe away any dirt.

[Q]: Objective: how to tell if a seashell is alive or dead
[A]:
a live seashell is a shell with animal tissue still attached to it. A dead shell is a shell with no animal tissue inside it.