sentence: Wood is very hard to cut, but it is also very strong.
sentences_after: A lumberjack is a person who cuts down trees. After a tree falls, the wood in it can be cut into long, straight pieces called lumber. Lumber can then be used to make posts, or put together with nails, screws, or even glue to make wooden frames for other shapes.
concept_name: wood
headings: Wood
categories: Basic English 850 words