Ms. Lin is teaching a reading lesson on environmental protection. Before reading, she shows students pictures of polluted oceans and asks, "Have you ever seen plastic waste at the beach? How did it make you feel?" During reading, she encourages students to guess unfamiliar words like "contamination" by looking at surrounding sentences. After reading, she asks students to summarize the main idea in their own words. Which combination BEST describes the strategies Ms. Lin employed in sequence?