Является самым употребляемым из всех трёх. Используют, когда хотят найти что-то (или кого-то) потерянное или в случае если срочно нуждаются в этом. Данный глагол почти всегда уместен в любой ситуации. Может полностью заменять "seek" и "search for".

Christopher Columbus (1451 – 1506) was a sailor. He discovered America for Spain in 1492. After that he returned to America three more times. At that time they believed that the new land was not America, but Asia.
Like many people of his time, Columbus knew that our planet is round. Sailors from Europe sailed east to the “Indies” (Asia). They brought back gold and many other wonderful things. Columbus thought that if he sailed west but not east he could get to Indies too. The queen and king of Spain gave him ships and money to sail there.In 1492, Columbus sailed west on three small ships, the Santa Maria, the Pinta and the Nina. The ships sailed for three weeks. The sailors didn’t see any land and became afraid. Then on October 12 they saw an island in the ocean. Columbus named it San Salvador. When he returned to Spain he had a hero’s welcome.

Columbus thought that the new land was Indies. This is why he called the people he met Indians. These islands still have the name of the West Indies.

When Columbus sailed to America for the third time he landed on the coast of today’s Venezuela. People think that it was the first time in 500 years for a European to set foot on the American Continent. Columbus’s travels are some of the most important happenings in history.