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C. five million of
D. million of 2.The Sun and its planets ___________the solar system. A. called
B. named
C. is called
D. are called 3.It is hard __________ his strange idea. A. understand
B. say
C. understood
D. to understand 4.However, no one ________ any life in space yet. A. has been discovered B. discovered C. has discovered D. have discovered 5.— Have you finished ______ the words yet — Yes, I ________. A. copying; did B. to copy; did C. copying; have D. to copy; have 6.Jenny likes _______ her friends by telephone. A. staying with
B. communicating with
C. worrying about
D. thinking about 7.I heard scientists _______ a new planet last month. Is that true A. touched
B. built
C. discovered
D. produced 8.Susan will _______ Beijing next Monday morning. A. reach
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