* Canada approves CNOOC bid for Nexen, Petronas buy of
Progress
* Ottawa to impose stricter conditions on foreign investment
* Raises questions about future resource-sector investment
* Canadian dollar, Nexen shares soar
* CNOOC agrees to commitments on transparency, investment,
others

(Adds details, edits)
By David Ljunggren and Charlie Zhu
OTTAWA/HONG KONG, Dec 8 (Reuters) – Canada approved China’s
biggest foreign takeover, the $15.1 billion bid by CNOOC Ltd
for ener