. Complete the text using the correct forms of the words. Write down the words in your exercise book.

...The spaceship flew around the new planet several times. The

(1) ... planet looked green and blue. The astronauts made a ]]KNOW]]

(2) ... to land and explore it. They slowed down (3) ... They stepped ]]DECIDE, CARE]]

out of the spaceship. Nothing betrayed the (4) ... of life. One ]]PRESENT]]

astronaut was left to cope with an urgent (5) ... , if necessary. SITUATE

After an hour of (6) ... they understood that there was no ]]EXPLORE]]

(7) ... on that planet. ]]CIVILISE]]

1. unknown 2. decision 3. carefully 4. presence 5. situation 6. exploration 7. civilisation