The phrase "fond of" is a common idiomatic expression used to indicate a liking or enjoyment of something. 

1. To
2. With
3. Of
4. None of these

1. At
2. In
3. On
4. None of these

1. About
2. With
3. On
4. None of these

1. On
2. Off
3. Up
4. None of these

1. At
2. With
3. On
4. By