Exercise 20 โต๊ะ

https://drive.google.com/file/d/0B36G3-iwYUZ-Mzd3bXVBMmZRcWc/view?usp=sharing

Exercise 8

https://drive.google.com/file/d/0B36G3-iwYUZ-OHptd21Pd0ZNTVE/view?usp=sharing

Exercise 10-11 ล้อ

https://drive.google.com/file/d/0B36G3-iwYUZ-WFR1Q18waENrTmc/view?usp=sharing

https://drive.google.com/file/d/0B36G3-iwYUZ-UVBuQXBBRFlwQ28/view?usp=sharing