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watching many kinds of animals studying dinosaurs’ living relatives following the tracks left behind working on dug-out dinosaur eggs
must be may have been can have been could be
they are more easily cultivated. they have been cultivated by many cultures for a long time. they can produce more paper than trees. they can provide more endurable fibers than trees.
Birds hardly pay attention to their young. Baby crocodiles can look after themselves well. Some dinosaurs took care of their young. Birds and crocodiles take good care of their youn
studying dinosaur fossils examining modern animals watching dinosaurs using telescopes
Half of the dinosaurs lived alone. Most dinosaurs moved long distances. Many dinosaurs settled in the north. Some dinosaurs lived in big groups.
should be set free will be set free are set free would be set free
Even if As far as If only So long as
Even if As far as If only So long as
Birds hardly pay attention to their young. Baby crocodiles can look after themselves well. Some dinosaurs took care of their young. Birds and crocodiles take good care of their youn
studying dinosaur fossils examining modern animals watching dinosaurs using telescopes
Half of the dinosaurs lived alone. Most dinosaurs moved long distances. Many dinosaurs settled in the north. Some dinosaurs lived in big groups.
have been known to scientists for many years have only recently been discovered are known by us will probably remain a mystery
watching many kinds of animals studying dinosaurs’ living relatives following the tracks left behind working on dug-out dinosaur eggs
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