Read the passage and then answer the question.

Franklin Roosevelt became president of the United States in 1933. It was a time of great troubles. Thirteen million Americans had lost their jobs, and many were running out of money. Americans were worried. Roosevelt quelled people's fears by talking about his plans for America, explaining them so that people felt comfortable. He gave talks, called "fireside chats," on the radio. These chats helped Roosevelt become one of the most popular presidents in history.

What is the meaning of quelled as used in the passage?

The vulture is a large bird with an unusual diet. Humans generally avoid eating spoiled food. But to a vulture, nothing is better than a large helping of rotting meat. They will gather around a dead animal and eat it with gusto. Scientists aren't sure why, but vultures don't get sick from eating spoiled meat. It may be that something in the vultures' bodies keeps them healthy. Whatever it is, it lets vultures do an important job. They get rid of wormy, rotten stuff that could make people ill.

What is the meaning of gusto as used in the passage?