I need help with the blanks

What is the force of attraction between the particles in a salt crystal

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?