there____(exist) a big pine tree at entrance to the valley

there____(exist) a big pine tree at entrance to the valley
1.look!the flag____(raise)now.
raise是及物还是不及物,还有是不是不及物动词没有被动语态
2.Leaves ____from trees in autumn.(fall)
3.he was nervous,for he ____(never operate) on before.
4.it's rather cold day,but we expect that the temperature____(rise)tomorrow.