1. 用方框中所给单词或词组的适当形式完成句子。

partner; geometry; automatic; work out; reflect on; brush up; be based on; end up; in short; at the heart of

1. （1） I feel that is a difficult subject.
3. （2） Breathing is an function of the body.
5. （3） I've your share of the expense at $10.
7. （4） Our customers are everything we do.
9. （5） As people get older, they will the past.
11. （6） Spain has been one of Cuba's major trading .
13. （7） He on some language points before the exam.
15. （8） Science fiction is a type of writing that fantasy.
17. （9） At first he refused to admit his fault but apologising.
19. （10） He hoped for greater trust between the two nations, more trade, more cultural exchanges—, a lasting peace.