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1、The Earth is one of the ____ in the solar system.A、stars B、planets C、satellites D、moons
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2、The astronauts landed on the ____ in 1969.A、Earth B、sun C、moon D、Mars
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3、____ plastic bags can help protect the environment.A、Using B、Use C、To use D、Used
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4、The ____ is made up of the sun，planets and other objects.A、Earth B、solar system C、moon D、star
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5、We should ____ waste to save resources.A、increase B、reduce C、make D、have
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6、Many animals are in danger because of the ____ change.A、weather B、climate C、air D、temperature
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7、Scientists are trying to ____ more about other planets.A、see B、watch C、learn D、look
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8、The ____ on the moon is much weaker than that on the Earth.A、air B、gravity C、water D、light
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9、It's our duty to ____ the environment of the Earth.A、keep B、protect C、save D、make
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10、We should use ____ resources like wind and solar energy to protect the Earth.A、natural B、renewable C、useful D、clean
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11、The sun is at the ____ of the solar system.A、center B、middle C、side D、top
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12、The Earth is a special planet in the ____ because it has life.A、solar system B、moon C、star D、universe
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13、假如你叫李华，你刚从北京旅行回来。请你根据以下要点，写一篇短文向你的笔友Tom介绍你的旅行经历。
要点：（1）你去了北京哪些地方；（2）你在北京的活动（如参观景点、品尝美食等）；（3）这次旅行对你的意义。
要求：语句通顺，不少于80词，可适当发挥。
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14、How about taking a trip to the mountains？（改为同义句）
taking a trip to the mountains？
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15、It's an interesting talk show. (改为感叹句）
interesting talk show it is!
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16、The trip is exciting.（改为否定句）
The trip exciting.
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17、We should protect the old buildings.（改为一般疑问句）
we the old buildings？
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18、I want to explore amazing places because it's exciting.（对划线部分提问）
you want to explore amazing places？
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19、Let's （ make） a travel plan for the summer vacation.
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20、We should try （ learn） more about different cultures.