19. Put the verbs in brackets in the correct tenses.
1. By the end of this century, scientists (discover) intelligent life.
2. Beagle 2 - the first British spaceship to Mars - (look for) signsof aliens this time next month.
3. Astronauts (travel) to planets outside our solar system by 2050.
4. I expect your English (improve) a lot by the time you getback from England.
5. NASA (develop) new aircraft to replace space shuttles by theend of this decade.
6. The four planets closet to the sun - Mercury, Venus, Earth, and Mars - (be) called the terrestrial planets because they have solid, rocky surfaces.
7. Our grandparents (come) to stay with us next weekend.
8. People (wonder) for ages whether we are alone in the universe.
9. This time next week, we (take) an English test.
10.By the end of this year, I (learn) English for 6 years.