填空题

Humans are dependent on oxygen and water for (survive)（）

【参考答案】

survival
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填空题
Education is regarded as the key (make)（）progress.
单项选择题
What is the most probable relationship between the two speakers（）

A．Guest and host.
B．Waiter and customer.
C．Employer and employee.
D．Husband and wife.
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