121.
The Nuclear Non-Proliferation Treaty came into force in -

122.
In which year was the first world environment day observed?

123.
Hong Kong will be transferred to China in -

124.
Which of the following year is celebrated as International Year of Biodiversity?

125.
Which of the following year is celebrated as International Year of the Potato?

126.
First Indian Arctic Expedition was launched in the year -

128.
Which of the following year is celebrated as International Year of Forests?

129.
Which of the following year is celebrated as International Year of Sanitation?

130.
Which of the following days is celebrated as the International Labour Day?

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