Complete the paragraph with the correct transitional words.
The entire universe we see today was smaller than the size of a pea some 14 billion years ago. At the time, there was no sun, or any of the other stars we see today when we gaze into the night sky. Blank 1, suddenly, this pea-sized universe burst out and grew a trillion times bigger in less than a trillionth of a second. Physicists call this event the Big Bang. But no one has figured out how the Big Bang happened and why. Blank 2, scientists are clueless about what existed before the Big Bang.
Blank 1
Before
Then
For example
Blank 2
Moreover
Lastly
Finally