16

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Do you know the reason ___________humans are interested in Mars and other planets in the solar system?

 A:whose
 B:which
 C:that
 D:why

17

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

I passed all my exams - I’m ___________!

 A:out of this world

 B:over the moon
 C:out of the moon
 D:once in a blue moon

18

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

A ___________ is an enormous system of stars in outer space.

 A:galaxy

 B:solar system
 C:universe
 D:comet

19

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Anyone can apply to train as an astronaut.

 A:mission
 B:cosmonaut
 C:astronomy
 D:satellite

20

Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

How often do you play football? – Oh, once in a blue ________.

 A:earth

 B:sun
 C:moon
 D:star