目录：
Unit 1 Look it up!
Section 1 Experiencing and understanding language
Reading
Listening
Section 2 Exploring and applying rules (Grammar)
Section 3 Expressing and communicating ideas
Speaking
Writing
Section 4 Extending and developing competencies
Focusing on culture
Cross-curricular connection
Checking your progress (Project)
Unit 2 Amazing numbers
Unit 3 Our digital lives
Unit 4 Inventions
Unit 5 Going on an exchange trip
Unit 6 Wisdom counts
Unit 7 The secret of memory
Unit 8 Pets and us
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