11. Farmers and fishermen have been waiting for the annual ______________ season to earn more money as the water is expected to wash away saline residue and protect aquatic resources.
A. flood B. water C. rain D. flooding
12. Ca Mau Province has the longest navigable ______________ in the Mekong Delta - over 7,000 kilometres.
A. waterline B. waterfront C. waterway D. watercourse
13. Many habitats such as ______________ and wetlands are disappearing fast.
A. mangroves B. areas C. suburbs D. regions
14. These ______________ are designed to reduce pollution.
A. actions B. quantities C. measures D. levels
15. Try to keep a(n) ______________ between hunters and prey in the nature.
A. equality B. right C. dominance D. balance
