Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to study vocabulary words [title] Choose paper or electronic flash cards. [step] Paper flash cards are easy to carry around, and writing by hand may help you memorize the words more than typing. On the other hand, you can't lose a phone app or online tool.

Ending1: If you've got a lot of time on your hands at work, buying flash cards can help you study faster and learn more vocabulary words. [substeps] If you are going through a difficult time, it is often useful to bring your wallet so you can take care of your wallet. Ending2: If you've never used a flash card before, an online flash card can take you far from what you need to remember. [substeps] Tablets, smartphones, and laptops can also be useful. Ending3: Some flash card software even lets you speak the words aloud, then writes the cards for you. [substeps] If using paper cards, try to find something small that you can carry in your pocket. Ending4: Another option is to stick with the electronic flash cards, which are durable and easy to carry around. Turn them into fancy writing cards, or use construction paper.

Answer format: ending1/ending2/ending3/ending4