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After a long hiking, the boy was ________ tired to walk.

A．too              B．to               C．so               D．very

It’s difficult for us       work out the math problem．

A．too                B．to                        C．by

After a long hiking，the boy was _________ tired to walk．

A．too           B．to              C．so                D．very

 The old man was        angry       say a word.

A. too; too         B. so; to           C. very; to         D. too; to