Дополните текст, используя артикли a/an либо the там, где это

Дополните текст, используя артикли a/an либо the там, где это нужно.
1) engineering students should have 2) understanding of 3) maths, physics and chemistry. Working with 4) pharmaceuticals, 5) food, mineral processing and chemical manufacturing, 6) chemical engineer is trained to understand, design, control, and investigate material flows. If you enjoy problem solving and find 7) projects such as 8) Channel Tunnel and 9) Three Gorges Dam interesting, civil engineering may be for you. You will produce 10) creative designs at 11) economical price while paying due concern to 12) environment. If your interest is in road building then you may decide to follow