________ recent report stated that the number of Spanish speakers in the U.S.would be higher than the number of English speakers by ________ year 2090.
All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.
It was the building of the rail network from the west to the east coast ________ brought even larger numbers to California in the 1860s.
_______ from the top of the mountain, we found the city more beautiful.
Do you know the stages every inventor must ________ before they can have their invention________ .
The dodo became extinct fairly recently so its DNA is still ________ .