Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make an electroscope [title] Gather your materials before you begin. [step] Any kind of plastic drinking straw will work. It just needs to be long enough to go through both holes in the cup.

Ending1: It doesn't have to be long enough to tie a fishing line snugly around the handle of the cup. [title] Thread the " tip " of the straw through both holes. Ending2: Try to center the straw so that there is an equal length on either side of the cup. [title] Use a sharp pencil to poke 2 holes on opposite sides of a styrofoam cup. Ending3: You will also need : [substeps] A tobacco stick. A strip of hair or braided hair a ruler or other functional instrument that you can use to record the proportions. Ending4: To make your first image, you'll need two medium-sized straws. [title] Open the larger of the two straws.

Answer format: ending1/ending2/ending3/ending4