9. A. cloud formation
B. moon
C. stars
D. sun
A. at noontime
B. in the morning
C. during a rainy day
D. when the sun shines
brightly
10. A. both tell time by the hour
B. both use water to tell time
C. both are used only in the daytime
D. both have a narrow center through which something flows
A. The Uses of Clocks
B. Why People Need to Tell Time
C. Ways of Telling Time: Then and Now
D. Comparing the Different Types of Clocks
d. Humans have used different objects to tell the time.
