摘要： value --- valuable

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__________ valuable advice it is. It will be of __________ great value to me.

A. What a; the B. What ; / C. How ; the D. How ; /

The rainforests can give us many____ things.

[　　]

A．valuable

B．value

C．used

D．usefully

Thank you for your _. They are of great _ to me.

Thank you for your _________. They are of great _________ to me.