1 . The project team believes such computers would ____________(起主要作用) teaching and learning. (根据汉语提示完成句子)

2 . It is well known that Van Gogh has________ ________ ________ ________ (重要影响) the development of modern painting. （根据汉语提示完成句子）

3 . Sugar is a ________ (主要原因) of tooth decay. (根据汉语提示完成句子)

4 . ________________ (主要问题) at present is how to overcome all the difficulties. (根据汉语提示完成句子)

5 . Shanghai and New York are ____________________(主要的金融中心). (根据汉语提示完成句子)

6 . Under no circumstances should we lose sight of________(我们的主要目标). （根据汉语提示完成句子）

7 . Scientists have_________(取得重大突破)in the treatment of cancer, bringing great hopes to those patients. （根据汉语提示完成句子）

8 . Over 40 per cent of adults use television as__________(他们主要的信息来源)about the arts. (根据汉语提示完成句子)

9 . Her __________ (主修课程) is history. (根据汉语提示单词拼写)