_____the problem of land erosion getting more serious, the government is searching for a way to deal with it.
The teacher has a peculiar way of ______her student’s nervousness when then speak English.
He_______the book and decided that he wouldn’t buy it.
Their water supply has been_______ because of the earthquake.
More and more people are willing to______part of their incomes to the school children in the poverty areas.
People in the west ______it a rule to buy Christmas presents for their relatives and friends.