CAN'T MAKE UP MY MIND

1. The following words share a very unusual quality. Can you determine what it is?

SANCTION

CLEAVE

BOUND

BOLT

2. What do the following words have in common?

TIN

TEN

TORN

TOUGH

TREAT

TREAD

Answers:

1. They are all self-contradicting words (auto-antonyms). Sanction means both to approve and condemn. Cleave means both to separate and adhere. Bound means both to leap and tie down. Bolt means both to fasten securely and to run away.

2. H can be added as the second letter of each word to make new words.