astronomy exam help??

I have some multiple choice questions I just can't seem to find the answers too, also I really am on a crunch for time so any help is appreciated!

9)to begin to collapse into stars, an interstellar could must be..

a-cold and thin b-cold and dense c-hot and thin d-hot and dense

10)main-sequence stars of which spectral class use the CNO cycle?

a-A b-G c-K d-M

11)bok globules contain..

a)1-2 solar masses

b)10-1,000 solar masses

c)10,000-1,000,000 solar masses

d)more than 1,000,000,00 solar masses

12)if an object formed from a cloud of dust and gas is less than 0.08 solar masses, it forms a..

a)yellow dwarf b)black dwarf c)white dwarf d)brown dwarf

I have a ton of more I don't know, but I obviously can't type them all, if you wanna be amazing and help me out with more or just go through the rest of the 80 questions and tell me what you know i can email you the exams!!

i am just so stressed out any help is appreciated!

thnx