factory: a building where products are made
fall: an instance of something becoming smaller in size or amount
grow: to start as a seed and become a tall plant. The past simple is grew.
improve: to make something better
increase: to become more in number or value
leave: to go away. The past simple is left.
move: to change the place where you live
safe: not in danger
scared: very worried that something bad will happen
terrible: very bad