Select the Correct Word(s) in Each of the Sentences Below

Select the correct word(s) in each of the sentences below. Type the words into the blanks. If there are multiple correct answers on one line, separate the answers with a comma and a space (i.e., answer 1, answer 2). Remember to capitalize the first word in a sentence
-When I moved here, I started ( watch / watching ) people ( to interact / interacting ).