1 . The factory produces half a million pairs of shoes every year, ________________ (它们中的80%) are sold abroad. （根据汉语提示填空）

2 . Sandstorms often hit this region, ____________therefore has made the soil there become desert. （用适当的词填空）

3 . It is___________ (典型的) of him to ___________ (装饰)a room with different colors, which___________(范围) from red to yellow. （根据汉语意思完成句子）

4 . Some people think that the great Chinese scholar Confucius, __________ lived from roughly 551 to 479 B.C., influenced the development of chopsticks.（根据句意填空）