2. The problem of free will (vex) philosophers for centuries.

3. Many researchers (investigate) the effects of poverty on health.

4. Donald Trump’s election in 2016 (contradict) the predictions of commentators.

5. We (find) a positive correlation between the variables, but it was not as strong as we hypothesized.

6. We (transcribe) and (code) the interviews before analyzing the results.

7. Chapter 3 (explain) the methodology and discusses ethical issues.

8. In the first novel, Harry (learn) he (be) a wizard and (travel) to Hogwarts for the first time, finally escaping the constraints of the family that raised him.

9. Light (travel) faster than sound.

10. Certain rigorous studies evaluating the effects of sex differences (be) effective in bridging the divide between animal and human work.

11. Earlier this year, a study (demonstrate) that mice with XY chromosomes in the central nervous system had greater neurodegeneration than did those with XX chromosomes.

12. There (be) currently 40 offshore oil platforms in Gabon.

13. We (conduct) underwater visual fish consensuses using two methods.

14. Since 2010, we (register) over 450 users.

15. Social media (include) styles of writing that differ from standard usage.

16. Workers (install) extra loudspeakers because the music in tonight's concert will need amplification.

17. By the time the senator finished his speech, the audience (lose) interest.

18. Before injuring my leg, I (run) in four marathons.

19. Research (show) that cycling can help patients overcome their illnesses.

20. According to yesterday's newspapers, astronomers in Australia (discover) a planet in a galaxy

close to our own.