Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to stay on top of homework [title] Use down time to study. [step] Carry at least some of your homework around with you. Whenever you find yourself doing something that doesn't use your total concentration, pull out your homework and spend some time on it.

Ending1: This is particularly easy to do with reading assignments. If your assignment is more complex, just scribble down a few notes to get the brainstorming process started. Ending2: You can even include a break in your school homework, if you have one, to mark homework time. [substeps] Having a break can help remind you to concentrate and allow you to study for more material. Ending3: [substeps] A good rule of thumb is to do ten assignments an hour. Five for smaller projects and three for larger projects. Ending4: Give your full attention to the subject that you are studying, as studying is about staying on top of it. [substeps] If your homework is still in your hands after a bit of time, put it to use as a reward.

Answer format: ending1/ending2/ending3/ending4