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A number of scientists found genes in the 18th and 19th centuries. Scientific discoveries were made one after another in the 18th and 19th centuries. Many scientists succeeded in finding out how the features of living things were passed on to the next generation in the 18th and 19th centuries. It took a long time for scientists to find out why members of the same family look like each other.
will be held be held is held was held
will be held was held has been held is being held
happened takes place was held was taken place
was held will be held has been held is being held
Right Wrong Not mentioned
Was it when; that When was it; that Was it when; when When was it; when
held will be held were held have been held
is；held will hold will；be held does；holD.
how long the Winter Olympic Games last how long do the Winter Olympic Games last how often are the Winter Olympic Games held how often the Winter Olympic Games are held
In, held On, was held At, held For, were held
to be held holding held being held
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