Each of the following words can be changed into a new one according to a certain pattern. What is the pattern and what are the new words?

1. DRESS
2. WRITING
3. VALET
4. ERIE
5. COMA
6. NUDE
7. INDICTED

Answers:

Each word can be changed into a new one by the insertion of a single letter - without any other change in the order of the letters:

1. DURESS
2. WRITHING 
3. VARLET
4. EERIE
5. COMMA
6. NUDGE
7. INDICATED