Answer:
The first earth satellite marked a new epoch in the study of the universe.
Explanation:
I would write them all out but im lazy. change the noun after the word by and make that the subject of the sentence followed by the verb and the rest of the sentence :)
An auditory learner learns best by listening or talking, so the best way for him to process is notes would be for him to read them out loud.
The lieutenants arm is amputated
