Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to add nitrogen to compost [title] Add fresh grass clippings to the compost. [step] Collect the grass clippings left after you mow your lawn. Add the clippings in thin layers to the compost so that it doesn't clump up into big chunks.

Ending1: This ensures you have enough for about eight pallets of compost. [title] Raise your compost intake to 80 lb (475 kg). Ending2: [substeps] Make sure that your grass clippings are fresh because dried grass clippings will add carbon to the compost. [title] Add leafy plant clippings to the compost. Ending3: Weed to keep it from piling up in the compost. [substeps] The better you treat your lawn, the less weed you will see. Ending4: [substeps] Adding fresh grass clippings is great because they add little to no nitrogen. Before you heat the hay, pick up a scrap of straw or leaf material and toss it in the compost.

Answer format: ending1/ending2/ending3/ending4