10 Inventions that Changed the World
Unit 02: The Printing Press

STT	Tên task	Số câu hỏi	Audio
1	- Overview	1	No audio
2	- Vocabulary	44	No audio
3	- Notice	7	No audio
4	- Challenge	5	No audio
5	- Study	1	No audio
6	- Apply	1	No audio
7	- Read	1	No audio
8	- Think	19	No audio
9	- Reorganize	6	No audio
10	- Practice	22	No audio
11	- Watch and talk	1	No audio

Unit 01: The Wheel

Unit 03: Electricity