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Many explorers have ... to the North Pole. (go - been - going)
been
Nobody is here. They have ... to find new species in the rainforest. (gone - been - going)
gone
Edmund Hillary and Tenzing Norgay got to the top of Mount Everest ... . (since 1953 - almost 60 years ago - for almost 60 years)
almost 60 years ago
Kate has been studying endangered species ... . (for ten years - since 10 years - ten years)
for ten years
He has been collecting fossils ... he was a student. (for - ago - since)
since
Animal conservation became - has become more important in the last 100 years.
has become
Climate change caused - has caused many glaciers to melt.
has caused
The Giant Panda has been - was an endangered species for years.
has been
The puppy ... (drink) milk from a bottle for two months.
has been drinking or drank
The fisherman has been catching - has caught 50 kilos of fish since yesterday.
has caught
The scientists haven´t finished - haven´t been finishing their research yet.
haven´t finished
