填空题

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

【参考答案】

survival
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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.
填空题
He makes a note of the assignment lest he (forget)（）it.
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