Modern Water Treatment Systems – Teacher Answers

Teacher answer key

1. Warm-up: answers will vary.
2. Vocabulary: accept accurate contextual meanings.
3. Reading comprehension: 1) Large objects such as leaves, sticks and plastic. 2) So they settle and can be removed more easily. 3) Particles and some chemicals that affect taste/smell. 4) To kill harmful microorganisms. 5) They provide real-time water-quality information.
4. Grammar: 1) First; 2) Next / Then; 3) After that / Next; 4) Finally
5. Listening script: “Heavy rain can make river water more difficult to treat because it carries extra sediment into waterways. Treatment plants may need to slow the process, adjust chemical doses and monitor filters more closely until the water becomes clearer again.”
   Answers: 1) Extra sediment. 2) The water is dirtier/more turbid. 3) Chemical doses and process speed. 4) Filters.
6. Speaking: answers will vary.
7. Something fun: answers will vary.
8. Writing: answers will vary. Encourage students to use details from the lesson and accurate target language.

Puzzle/Game: answers will vary. Encourage students to use lesson vocabulary and explain their choices.

Success criteria: this is a student self-check. No single answer is required.

For open-ended tasks, accept different answers when students can explain or support them clearly.