Unit 1 Topic 1 I'm going to play basketball. Unit 1 Topic 2 We should learn teamwork. Unit 1 Topic 3 The school sports meet is coming. Unit 2 Topic 1 You shoud see a dentist. Unit 2 Topic 2 I must ask him to give up smoking. Unit 2 Topic 3 Must we exercise to prevent the flu? Unit 3 Topic 1 What's your hobby? Unit 3 Topic 2 What sweet music! Unit 3 Topic 3 What were you doing at this time yesterday? Unit 4 Topic 1 Which do you like better, plants or animals? Unit 4 Topic 2 How can we protect ourselves from the earthquake? Unit 4 Topic 3 The Internet makes the world smaller.