The engineers believed that the roller coaster was safe to ride again; , they decided to keep it closed until further test trials could be completed. Which transition best completes the sentence?

"but"

Explanation:

The best and only transition that works for this sentence would be "but". This states that even though the ride was safe the engineers still decided to go against the logical next step and maintain the ride closed until they could make certain that it was completely safe. If the second part of the sentence was a logical conclusion the transition could be "so" or "and". But that is not the case so this would be the best transition for the sentence.

the choice that is not a technique that you should use to come up with ideas for the topic of a research project is, writing about academic subjects that are not interesting to you. this does not belong to the techniques to come up with ideas because having no interest in a certain topic will lose your drive to come up with better ideas. it gives no room for improvement and acquiring of new ideas and information. 

explanation:

different strategies reach different people based on their ability to understand the material. (from personal experience) when writing an argumentative essay write explaining the subject as though your audience never heard of it before and it is just being introduced, then explain why other people hate it also, afterward you would explain why that would be wrong. i hope that : )