Directions: Fill in the blanks with the appropriate word.

I like listening to the radio, but I am not always impressed ___________ the quality of programmes.

The correct preposition after "impressed" is "with" when talking about being impressed by the quality or standard of something. We say "impressed with" the quality, program, or performance. While "impressed by" and "impressed at" exist in different contexts, this sentence specifically requires "with" for grammatical correctness.