急问几道 PP语法题，万谢！-->pumpkin转移

quekou

1. The numerous Cro-Magnon burial sites that been found reveal that these early humans, like the preceding Neanderthalers, engaged in various ritual activities.

2. Education in the United States is overseen by local school districts, which follow regulations mandated by their respective state government.

3. Oak threes furnish more timber annually in the United States than any of other broad-leaved tree and are second only to confifers in total lumber production.

4. Photographoer Edward Steichen constantly experimented new techniques and materials in his quest to have photography accepted as a creative art.  

上面四题都是什么错啊，我一头雾水，好象很多地方都错。敬请指教，快考了，急啊

谢谢！

friend_friend

1. that been found -> that have been found

2. government -> governments

3. any of -> any

4. experimented new -> experimented with new

quekou

非常感谢！！睡了一觉起来，才发现自己有多蠢