The following passage has not been edited. There is one error in each line. Write incorrect word and
the correction against the correct blank
In 1968, astronomers on Cambridge _____ ________
discovered a new classes of celestial ( sky) bodies a). _________ __________
which sent out radio pulses at regularly b). _________ _________
intervals of time. Once if 1.337 seconds, c). _________ _________
a pulse of radio noise were detected . d). _________ _________
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