单项选择题

For_____new or existing buildings, solar water heating is the most cost-effective way to reduce your fuel bills.（）

A．neither
B．nor
C．or
D．either

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单项选择题

Before submitting your essay, please be sure to include your_____at the end of it.（）

A．signing
B．signed
C．to sign
D．signature

单项选择题

Every three years, the board of directors should_____a new independent auditor to review financial reports.（）

A．deposit
B．appoint
C．predict
D．operate

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