He experimented with different materials before ____ the most suitable one. The technician ____ a button and lights started ____. When she pulled the large ____, the wheel began to ____. The zoologist ____ the animal and ____ its organs. When they were combined, the two chemicals ____ violently with each other. After analysing the problem, she concluded that there was a ____ in the theory. ____ the disk into the DVD drive to ____ the software or visit the website to download it.

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