题目内容：

四、完形填空。

        Time is very important to us. When and by whom were the watches or clocks _________? Perhaps nobody knows. How could we tell time if there were no watches or clocks anywhere in the world?

        The ________ was probably the world's first "clock", except in the far north, where the Eskimos live. There, it's dark most of the winter, and _________ most of the summer. But _________ most of the world, people have used the sun for day. _________ you don't have a clock that shows time, you still know that when the sun shines, it's day, and when it's dark, it's night. The sun can not only tell you whether it's day or night but also it's morning, noon, or afternoon. When the sun is almost directly overhead, it's _________.

        People who live near the sea know time from the tides(潮汐). In the daytime, for about six hours, the water rises _________ on the beach. The same thing _________ again at night. There are two high tides and two _________ tides every 24 hours.

        In some places in the world the wind comes up at about the same time every day or changes direction or stops __________. In these places the wind can be the clock.

1.A. discovered    B. found    C. invented    D. made

2.A. sun    B. moon    C. star    D. planet

3.A. wonderful    B. large    C. heavy    D. light

4.A. on    B. around    C. in    D. of

5.A. If    B. When    C. Although    D. As

6.A. morning    B. noon    C. afternoon    D. evening

7.

A. high and high    B. higher and high

C. higher and higher    D. high and higher

8.

A. takes place    B. is taking place

C. is taken place    D. will take place

9.A. wide    B. narrow    C. long    D. low

10.A. blows    B. blowing    C. blow    D. to blow