Problem: A joint venture led by Australia's Global Petroleum Ltd. said, yesterday, it had won the right to explore for oil and gas in the inhospitable waters south and east of the Falkland Islands.

Based on that paragraph can we say the following?
Petroleum will be explored in the South Atlantic.
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Answer: yes

Problem: Some people may think that there is no other way to grow plants other than in soil; there is however, another way.

Based on that paragraph can we say the following?
Plants are grown in substances other than soil.
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Answer: yes

Problem: The mystery of Alexander the Great's tomb still has not unraveled, and locating the burial of Alexander seems to have become an impossible mission for archaeologists.

Based on that paragraph can we say the following?
Alexander the Great's Tomb remains undiscovered.
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Answer: yes

Problem: Gamma ray bursts are some of the most powerful objects observed in the Universe and are thought to signal the birth of black holes. Swift is designed to detect the bursts and automatically re-orient itself to gather images and data of the phenomenon.

Based on that paragraph can we say the following?
Gamma rays are forms of electromagnetic radiation.
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Answer:
no