The Great Wall, _____ to be the longest wall in the world, runs across China like a huge dragon．

The international agreement, _______ encourage children not to smoke and help people to kick the habit, was signed on 27 February. 

______ other good students, the teacher thinks, Alice is _______ student．

______ nice and delicious, the fried chicken was soon sold out.

Russia will soon return 174 sq km of territory on the northeast border to China．     more than 40 years of negotiations．