The following words can be changed into new ones by making the same change to each of them. What is the change and what are the new words.

1. JUNK
2. PULL
3. BASS

HINT:
The same two letters can be added to each word.

Answer:

The letters ET can be added at the end of each word to make new words:

1. JUNKET
2. PULLET 
3. BASSET