Sentences that do not conform to standard punctuation signal an informal stream-of-consciousness style, because they tend to show how a person is thinking - you do not think in terms of commas and full stops.
Answer:
true I took a test on it at school
C because of the apostrophe after the s which indicated that they both participated
That book was published by mark twain in 1876
The way in which Faustus uses his powers is increasingly evil.
