Answer:
In "Civil Disobedience," Thoreau explains that he is put in jail because he is against war and slavery. Thus, he feels at peace because he is taking action for the principles that he believes in. Besides, he thinks that slaves must face worse things than him, even when he is in jail. As a result, he expects that his actions will inspire others to fight for their beliefs.
Is - two billion dollars is a unit, one unit so it is singular and you use the singular verb
think - scientists is a plural, therefore, you must use the plural verb form of think
Could you please clearify your question so I can further assist you
Run on sentence. A comma splice is a sentence that uses a comma when it should instead be either a colon, semicolon, or conjunction, and there is no comma so that is wrong. There should also be a period between bed and he. Here is what the complete senctwnces would look like: My dog sleeps beside my bed. He wakes me up in the middle of the night to let him out.