The sentence describes the action of birds in the sky. "Fly" is the verb that means to move through the air with wings. "Fry" means to cook food in hot oil.

Here are the completed sentences:

1. The sentence describes the action of birds in the sky. "Fly" is the verb that means to move through the air with wings. "Fry" means to cook food in hot oil. The completed sentence is: Some birds fly very high in the sky.

   The correct word is:

   $$\boxed{\text{fly}}$$

2. The sentence describes the purpose of going to the forest for wild fruits. "Collect" means to gather or pick. "Correct" means to make something right or accurate. The completed sentence is: They went to the forest to collect wild fruits.

   The correct word is:

   $$\boxed{\text{collect}}$$