"By the way, his clock is still seven minutes fast today."
Translation:Seine Uhr geht sieben Minuten vor.
Unfortunately this Adverbs 2 lesson is rife with many idiomatic phrases that the dictionary does not pick up on! Ridiculous that they do not even include phrases like "ab und zu"!
Don't give up! Learning a language always feels like this. If your brain feels like it is drowning and gasping for air, it just means that it is learning. :-)