Is there always a topic sentence in a paragraph?

The goal of __ painters was not to make a photographic representation of a subject, but to capture the impression of a particular moment in time a) still artist b) realist c) impressionist

Which sentence is correct? laura lent me her copy of cooking weekly so i could use a recipe. i enjoy doing crossword puzzles from the new york times. herman melville wrote the novel “moby d i ck.” maggie loves to read the smithsonian magazine.

Which sentence is correctly punctuated? a. i haven’t found a new job, and i don’t plan to look for one until i have to. b. my work is piling up—day to day—and i can’t seem to get caught up. c. i know things could be worse (they have been in the past).