单选题 There is a strong ______ between smoking and cancer.

单选题 The two countries are in dispute over the border ______.

单选题 A good leader must be ____ in approach.

单选题 The new policy has received ______ attention.

单选题 She is known for her ______ abilities in philosophy.

单选题 In the final game, they managed to ____ their rivals.

单选题 Artificial ____ is changing the world.

单选题 The book had a ______ effect on my thinking.

单选题 The tradition of shaking hands is believed to ______ in Europe.