Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to make a plastic sheet greenhouse [title] String up a clothesline between two bare trees, tightly, about head-high. [title] Drape a clear plastic sheet over the clothesline. [step] A standard 9'x12' size works okay, but for more space the bigger the better.

Ending1: Clip it with clothes pins to keep it in place. [title] Spread out the sides like an old army pup-tent and fasten them to the ground with rocks or bricks. Ending2: Don't try to use objects covering trees, because they can crack over time. [title] Place the plastic against the tree trunk. Ending3: [title] Take a piece of white paper and draw a line on the edge of the sheet with a pencil. [step] This line will act as a " crown " in the greenhouse, and the tree should hang onto the edge in the same manner. Ending4: It can be identical to a standard larger, but either size is fine. [title] Measure one tree (if measuring a whole tree) from the bottom to the top and mark that tree.

Answer format: ending1/ending2/ending3/ending4