30) The instructions ____ by Professor Johnson helped us know more about the danger of energy pollution.
A. that explained B. explained C. explaining D. which explained
Read the following passage and mark the letter A, B, C or D on your answer sheet
In 1969, the first astronauts from Earth …(31)….. on the Moon. They had prepared for the trip for a long
time and knew their mission …(32)……. doing things that had never been done before. The astronauts wore
special heavy boots to prevent them form floating off into space. On the Moon, they had time to collect Moon
rocks and soil ……(33)…… before returning to Earth. Those brave people, and others after them, are ..(34)
…… for much of the knowledge we know have about the Moon was formed. It is likely that scientists will
continue to learn more about how the galaxy was formed by studying the data …(35)…… back from the Moon.
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