The owners allowed us to pick some to eat because they don't have enough people to pick fruits and it would be a waste to let the ripe fruits fall. The owners allowed us to pick some to eat because they don't have enough people to pick fruit and it would be a waste to let the ripe fruit fall.

"Fruit" sounds better in this context. "Fruits" typically refers to many different kinds of fruit.

The owners allowed us to pick some to eat because they don't have enough people to pick fruits and it would be a waste to let the ripe fruits fall, so they'd otherwise go to waste. The owners allowed us to pick some to eat because they don't have enough people to pick fruits, so they'd otherwise go to waste.

What you wrote is fine, but this is more natural.

The owners allowed us to pick some to eat because they doidn't have enough people to pick fruits[the fruit | it] and it would [be | have been] a waste to let the ripe fruits fall to the ground. The owners allowed us to pick some to eat because they didn't have enough people to pick [the fruit | it] and it would [be | have been] a waste to let the ripe fruit fall to the ground.

Suggestion: …didn’t have enough people to pick it and didn’t want it to go to waste.

One of my friends was lucky to meet an owner jusout picking fruits, the owner invited her to eat the ripest ones. One of my friends was lucky to meet an owner out picking fruit, the owner invited her to eat the ripest ones.

One of my friends was lucky enough to meet [an owner rchard owner | a landowner] (just) picking fruits, the owner who invited her to eat the ripest ones. One of my friends was lucky enough to meet [an orchard owner | a landowner] (just) picking fruit who invited her to eat the ripest ones.

I was a little jealous because I wanted to meet an owner to ask for a beautiful branch with fruits. I was a little jealous because I wanted to meet an owner to ask for a beautiful branch with fruit.

I was a little jealous because I wanted to meet an owner to ask for a beautiful branch with fruits on it. I was a little jealous because I wanted to meet an owner to ask for a beautiful branch with fruit on it.

I was a little jealous because I wanted to meet an landowner to ask for a beautiful branch withfull of fruits. I was a little jealous because I wanted to meet a landowner to ask for a beautiful branch full of fruit.

As you may know(already) know / As you might have already heard, I went hiking on Saturday. As you may (already) know / As you might have already heard, I went hiking on Saturday.

More natural

The trail was in [the hills | some hills] behind a small village. The trail was in [the hills | some hills] behind a small village.

More natural, since you haven’t mentioned the village or hills before.

There were many waxberry trees ion these hills. There were many waxberry trees on these hills.

"in" implies that the trees were literally inside of said hills, and not ontop of them.

Now iIt's the season ofwhen waxberry ripenings. It's the season when waxberry ripens.

But I'd probably just say "They're ripe now."

Now is the season ofwhen waxberryies ripening. Now is the season when waxberries ripen.

More natural: Waxberries are in season now. When we say a fruit is “in season” we mean it’s ripe and ready to be harvested and/or it’s plentiful in markets.

NowCurrently, we're isn the season ofmiddle of the waxberry ripening. season. Currently, we're in the middle of the waxberry ripening season.