The most appropriate conjunctive adverbs for each sentence would be the following ones:
She had always wanted to go into outer space because her father was an astronanut; besides, she loved physics and astronomy.
The fire fighters battled the blaze bravely; meanwhile their families waited anxiousy for news.
She could have applied for a scholarship; instead she chose to take a student loan and pay the tuition fee.
First he whipped the eggs and added them to the flour; then he baked the mixture.