Ответ:
Разберем пропуски в тексте:
- engineers at SpaceX test a new prototype of a Mars rover.
- By 2040, they will work on this project.
- geneticists will perfect the process of growing human organs.
- in ten years' time, you probably will use your own holographic assistant at home.
- the line between science fiction and fact will disappear almost completely.
Ответ: test, will work, will perfect, will use, will disappear