Anagrammatically speaking 3

Question

Fill in the blanks below. Each sentence uses words that are anagrams of each other. In each pair of sentences, solve the first sentence, change one letter of an answer-word from that sentence, and shuffle it to form the answer-words for the second sentence. The answer-words in all sentences are the same length. Other than that, there is no correlation between answer-words from one sentence-pair to the next. All resulting sentences must make sense, and must use answer-words that are legal in Scrabble.

Similar earlier puzzles are here:
Anagrammatically speaking 2
Anagrammatically speaking

Pair 1:

The farmer sold one ______ before having to ______ to the barn to ______ for a cow.
They ______ collected trash for eight hours, and the next day they sure did ______.

Pair 2:

The governor’s ______ had the ______ first.
The concert-goers were a bit ______ afterwards, but their enthusiasm for the band did not ______.

Pair 3:

There is ______ at Barroh Harbor, where you can ______ for a fee.
The ______ of garbage was easily noticeable from the ______.

Pair 4:

Laurent Renault drew a coin from his ______ as the barman drew wine from a ______.
The cashier took ten seconds to ______ twenty ______.

Answer 1

I'm almost there, but can anyone improve on my doubtful Pair 4?

Edit: It seems to be the first variation, I'll leave the other so the comments work.

Pair 1:

The farmer sold one acre before having to race to the barn to care for a cow.
Change R to H.
They each collected trash for eight hours, and the next day they sure did ache.

Pair 2:

The governor’s aide had the idea first.
Change I to F.
The concert-goers were a bit deaf afterwards, but their enthusiasm for the band did not fade.

Pair 3:

There is room at Barroh Harbor, where you can moor for a fee.
Change M to D.
The odor of garbage was easily noticeable from the door.

Pair 4:

Laurent Renault drew a coin from his sack as the barman drew wine from a cask.

Preferred) Change K to N.
The cashier took ten seconds to scan twenty cans.

Other) Change K to E.
The cashier took ten seconds to case twenty aces.

I started with Pair 2:

aide – idea to get working with 4 letters.

I like the way OP makes anagrams of names –
Here is Barroh Harbor and Laurent Renault.
The previous puzzle had Dolly Lloyd.