PLEASE ANSWER FAST!!!

2/ Immediately after the Big Bang, the universe began to?
A/ cool down
B/ heat up
C/shrink
D/ condense

3/ A ____ Is a system of billions of stars and all of the planets that orbit around them?
A/ solar system
B/ universe
C/ galaxy
D/ planet

5/ Light energy moves in?
A/ waves
B/particles
C/ condensation
D/ plasma

6/ All of matter and energy in the universe was once contained in?
A/ a star
B/ a galaxy
C/ an element
D/ a singularity