The author implies that bacteria were investigated earlier than viruses because___________

Read the following passage and mark the letter A, B, C, or D to choose the word or phrase that best fits each of the numbered blanks from 25 to 29  

KEEPING THE WORLD IN OUR POCKETS

     Faster processors and advances in memory technology have made today's smartphones much more powerful than a lot of computers from just a decade ago. With wireless technology, people can surf the internet, play online games, send e-mail, and do (25) ___________all the things they once could only do on a computer. (26) ___________they have the power to do things constantly at their fingertips. 

     Many people (27) ___________that while smartphones are powerful tools, they are making people reliant on them. Why would a person need to learn to read a map when he can get directions to anywhere by simply asking his phone a question? Who needs to learn Math when you have immense calculating power in your pocket at all times? What (28) ___________is there to memorize facts about history, art, or geography when that information is readily available from a portable Internet interface?  

     There are just some of the questions being asked and answered as smartphone usage continues to spread. Like any technology, smartphones have their advantages, but they do have disadvantages as well that we must (29) ___________an eye on.

 Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions.

- Peter: "What ___________ your flight?”  

     - Mary: “There was a big snowstorm in Birmingham that delayed a lot of flights."