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1、 我们可以在科学课上了解太阳系。
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2、 地球是我们的家，我们应该保护它。
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3、 Let's start a project about the Earth.（改为同义句）
starting a project about the Earth?
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4、 The Sun is the center of the solar system.（改为感叹句）
the Sun is the center of the solar system!
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5、 Studying the solar system is interesting.（改为否定句）
Studying the solar system .
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6、 We should save natural resources.（改为一般疑问句）
we natural resources?
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7、 We protect the Earth because it's our home.（对划线部分提问）
we protect the Earth?
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8、 Let's work together ____ a better future for the Earth and its neighbors.A、create B、creating C、to create D、created
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9、 —Do you know how to save water? —Yes, by ____ dripping taps.A、fix B、fixing C、fixes D、fixed
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10、 It's good ____ us to use renewable energy.A、for B、of C、to D、with
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11、 ____ to the Moon is a great achievement for humans.A、Travel B、Travels C、Traveling D、Traveled
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12、 The Earth's climate ____ due to human activities.A、change B、changes C、changed D、is changing
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13、 We should ____ the importance of protecting the Earth to others.A、spread B、hide C、forget D、ignore
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14、 The teacher ____ us about the Moon's surface yesterday.A、tell B、tells C、told D、telling
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15、 ____ the Earth and its neighbors can expand our scientific knowledge.A、Study B、Studies C、Studying D、Studied
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16、 —____ is the center of the solar system? —The Sun.A、What B、Which C、Who D、Whose
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17、 Let's ____ a project to study the Earth and its neighbors.A、start B、starts C、starting D、started
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18、 Using renewable energy ____ us protect the environment.A、help B、helps C、is helping D、helped
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19、 —Can we see stars during the day? —No, we ____ because the Sun is too bright.A、can B、can't C、must D、mustn't
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20、 It's interesting ____ about the solar system in science class.A、learn B、to learn C、learning D、learned