摘要： Stamps are used for sending letters.

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Stamps are used for ______ letters.

A. send
B. to send
C. sending
D. sent

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Stamps are used for _____ letters.

[ ]

A. to send
B. send
C. sending

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Stamps are used for ________ letters.

A. send

B. sending

C. sent

D. sends

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Stamps are usually used _____letters.

A．to sending

B．to send

C．for send

D．for sent

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Stamps ________ for sending letters．

A.
used to
B.
used
C.
is used
D.
are used

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