15.Complete the sentences, using the form of the words in brackets.

1.   Anna asked me if the astronaut’s costumes were made from                  . clothing.(breath)

2.   After going through a storm, the plane began shaking                             . (controllable)

3.   We definitely cannot live on the planet shown in this photo because it is                       . (water)

4.   Mr. Amstrong is working in a                              space which has no gravity. (weight)

5.   The story talked about a                           who wanted to occupy the spaceship.(terrorism)

6.   When astronauts have trouble in outer space, they must act                                . (appropriate)

7.   I feel                      in the chat room because they are discussing a totallystrange topic.(visible)

8.  Hung has some                                    skills in speaking English with foreigners.(communicate