1) Astronomers study different ________________ in the night sky. a) experiments b) spacecrafts c) constellations 2) NASA's latest _____________ to Mars launched successfully last week. a) constellation b) mission c) rocket 3) The _________________ of the Earth protects us from harmful rays. a) atmosphere b) ground c) surface 4) Many dinosaurs became ____________ millions of years ago. a) awesome b) extinct c) sucessful 5) The ______________ is full of mysteries waiting to be discovered. a) road b) space c) place 6) Astronauts wear ___________ suits to protect themselves in space. a) bulky b) tight c) loose 7) Some species of animals have gone ________ due to human activities. a) extinct b) wild c) pets 8) Rocks are a __________ material found on the surface of planets. a) soft b) solid c) big 9) A ________________ is a spacecraft used for exploring outer space. a) plane b) helicopter c) space probe 10) It's important to __________________ the order of the planets in our solar system. a) forget b) write c) memorize 11) Scientists are _____________ about the impact of climate change on Earth. a) happy b) thrilled c) concerned 12) A ____________ is a tiny piece of matter that makes up everything. a) particle b) part c) party 13) ___________ technology helps astronauts navigate in space.  a) computer b) GPS c) robot 14) The _____________ was so loud that it could be heard from kilometers away. a) destruction b) explosion c) extinction

Primary path 4 - Units 2a-2b

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