[填空题]Early men did not have clocks. They were told time 76.
by the sun and shadows of trees. At first time, they used 77.
sticks placed in the ground instead trees. They made 78.
marks in the ground, and the shadows from the sticks told 79.
the time of day. Later, men began to use sundials. Some of 80.
sundials were boxes with sticks cast a shadow. Men were 81.
able to take the sundial box with them. The mark for noon 82.
was very important. The sundials always have to face the same 83.
way or the time was wrong. Sundials were good only on sunny 84.
days, not on cloud days. They were the first kind of clock. 85.

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[填空题]Early men did not have clocks. They were told time 76. ______
by the sun and shadows of trees. At first time, they used 77. ______
sticks placed in the ground instead trees. They made 78. ______
marks in the ground, and the shadows from the sticks told 79. ______
the time of day. Later, men began to use sundials. Some of 80. ______
sundials were boxes with sticks cast a shadow. Men were 81. ______
able to take the sundial box with them. The mark for noon 82. ______
was very important. The sundials always have to face the same 83. ______
way or the time was wrong. Sundials were good only on sunny 84. ______
days, not on cloud days. They were the first kind of clock. 85. ______

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