Read the following passage, choose the option (A, B, C or D) that best fit the blank.

The Cycle of The Moon

Once a month, the moon travels in a complete circle (21)………… the earth. As it moves in circle, it (22)………… to change shape. This is because we, on Earth, (23)………… only that section of the moon that catches the sun’s light.

When the sun, the moon and the earth are in a straight line with the moon in the middle, it is impossible for us to see the moon. At this point, the moon is said to be new. We are unable to see it in this position because the side facing the (24)………… is in shadow. As the new moon begins to circle the earth, however, we begin to see that part of its surface that catches the sun (25)………… . After some days, when it reaches the position where the earth (26)………… the sun and the moon, we see the full moon. Later, it again (27)………… half moon, becoming smaller and smaller until it disappears again to become the new moon. This cycle takes 28 days or a lunar (28)…………

21. A. around                  B. under                         C. between            D. through

22. A. looks                    B. wants                         C. seems               D. takes

23. A. hear                      B. know                          C. see                    D. understand

24. A. sun                       B. earth                          C. moon                D. sky

25. A. light                     B. energy                        C. hear                  D. movement

26. A. across                             B. between                      C. over                  D. after

27. A. sees                      B. goes                           C. gets                  D. becomes

28. A. week                     B. month                        C. fortnight           D. year