III. Choose the word that best fits the blank space in the following passage. (1.5 pts)

This car runs on chocolate!
Scientists have built a 300kph racing car that uses chocolate as a fuel! The project is (17) ________ to show how car-making could (18) ________ environmentally friendly. The car meets all racing cars (19) ________ apart from its fuel. This is a mixture of waste chocolate and vegetable oil, and such ‘biofuels’ are not allowed in the sport yet. It has to be mixed with normal fuel so that all parts of the car keep (20) ________.
Carrots and other root vegetables were used to make some parts inside and outside the car. Even the mirrors are made (21) ________ potatoes! The sides of the car contain a mixture of natural materials from plants (22) ________ other recycled materials.
The project is still young, so the scientists have not yet found out how ‘green’ the car is.
https://teacherphill.com/pet-reading/#Part_5_- 4-option_multiple_choice_cloze