IV. Read the following passage and choose the best answer for each blank.

Viet Nam is listed by the World Bank among the countries most (26) _______by rising waters brought about by higher global temperatures. Such a rise of one meter (27) _______ a third of the Mekong Delta underwater and lead to mass internal migration and devastation in a region (28) _______ produces nearly half of Viet Nam's rice.

The vast, humid expanse of the delta is home to more than 17 million people, who (29)_______ for generations on its thousands of river arteries. But rising sea water caused by global warming is now increasing the salt content of the river water and (30) _______the livelihoods of millions of poor farmers and fishermen. Climate change is (31) _______the rivers of the Mekong Delta salty.

In Ben Tre, salt water reached as far as 35 miles inland, causing significant (32) _______to crops and livestock, with rice production particularly affected. It is said that there are three grams of salt per litre of fresh water in the rivers now. Gradually, more and more people are affected: (33) _______nearest the sea are the most affected now, but soon the whole province will be (34) _______. The salinity of the water has (35) _______ a point where many locals have been forced to abandon their traditional rice cultivation.

The vast, humid expanse of the delta is home to more than 17 million people, who (4)_______ for generations on its thousands of river arteries.