Which one of these sentences would be considered inappropriate in formal writing a. next, he prepares to conduct his experiments b. he hates to be late c. he reviews the reports of his assistants d. dr. thompson arrive promptly each morning

To my mind, the answer ( B ) is the inappropriate  sentence. In a formal writing  informal tone must be avoided as well as colloquial expressions.

the most ethic and honorable thing for the newspaper to do are:

be completely transparent in reporting about the company’s attempt to trade favors.

contact other construction companies to tell them about the situation.

these two options are the most ethic because both promote the market fair course, by telling the other competitors about the company attempt to get ahead in the market by trading favors, the market is guaranteed equality and justice in the trading of goods and services.