Put the verb in brackets in the correct form. Pay attention to positive or negative form.

(Đặt động từ trong ngoặc ở dạng đúng. Chú ý đến dạng khẳng định hoặc phủ định.)

In the near future, there (1. be) _____ enough land for the world's increasing population. Though skyscrapers are getting taller, there (2. be) _____ enough land to house everyone. Air pollution (3. get) _____ worse and worse. Scientists (4. look) _____ for new opportunities to live on other planets. Mars (5. become) _____ a new place for humans to live. Scientists someday (6. invent) _____ a way for us to go to Mars and return quickly. Scientists (7. plant) _____ trees on Mars to produce more oxygen. Additionally, they (8. build) _____ up hotels for holidays on Mars because there (9. be) _____ many people who want to go there. I think it (10. take) _____ a long time for this dream to come true.