The Rock and Roll Hall Of Fame and Museum opened the nation's first major John Lennon retrospective Thursday (October 19) with a gala party attended by his widow, Yoko Ono.
Can we say the following?
Yoko Ono is John Lennon's widow.

yes

Oil prices this Tuesday rose sharply in New York and London reaching a record 42,33 US dollars per barrel, 2.45 US dollars more than last Friday.
Can we say the following?
Oil prices this Tuesday surged to an all-time high in New York, at 42 dollars a barrel, 1.92 dollars a barrel more than last Friday.

no

The new work went an extra step, suggesting that the connections that the stem cells form to help bridge the damaged spinal cord, are key to recovery.
Can we say the following?
The experiment, reported Monday, isn't the first to show that stem cells offer tantalizing hope for spinal cord injury.

no

The Federal Bureau of Investigation started an independent probe of the circumstances shortly after the White House made plain that President Bill Clinton considered industrial espionage a particular threat to US economic interests.
Can we say the following?
President Clinton thinks that industrial espionage is a threat to America's well being.
yes