1 . Do you know how many _______________ (因素) are contained in a useful report? (根据汉语提示单词拼写)

2 . Unemployment is the most important _____(因素) in the growing crime rates. (根据汉语提示单词拼写)

4 . There are many ________ (因素) leading to happiness，such as receiving good education and getting along well with others. （根据汉语提示拼写单词）

5 . There are two sources of increased heat, which is the main f_______ making the flowers bloom earlier: urbanization and climate change. (根据首字母单词拼写)

6 . In developing a design, one has to take account of the key ______(因素)．(根据汉语提示单词拼写)

7 . California has lost half its big trees since the 1930s, according to a study to be published Tuesday and climate change seems to be a major __________ (因素).(根据汉语提示单词拼写)

8 . If these ________(因素) are all organized around music, the child may become a musician. (根据汉语提示单词拼写)

10 . The major ________(因素) in the decision to stay or to leave was usually professional. （根据汉语提示单词拼写）