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Oxford 6
Author :
Niza Cuevas
1.
geyser send jets of hot water into the air. (can)
2.
in the future, many of Iceland's volcanoes erupt. (could)
3.
I help you find some information about Earth's mantle? (can)
4.
that man be a geologist because he knows so much. (must)
5.
people study biology without modern technology a hundred years ago, (had to)
6.
geologists handle fossils with special care because fossils are so old. (need to)