invest [to give money to a business or organization with the hope of making more money]
George asked his friends to invest in his new oil company.
investigate [(1) to study or examine all information about an event, situation or charge; (2) to search for the truth]
Civil rights leaders asked the federal government to investigate voting problems in some parts of Florida. (1)
Congress is investigating the president's relationship with a young woman. (2)
invite [to ask someone to take part in or join an event, organization or gathering]
Jason invited Candy to his party.
involve [(1) to take part in; (2) to become a part of; (3) to include]
He has been involved in drama for many years. (1)
She became completely involved with her new family. (2)
The project involved thousands of people. (3)
iron [a strong, hard metal used to make machines and tools]
People have been making tools of iron for about 2,800 years.
island [a land area with water all around it]
Ken lived on several different islands in the South Pacific Ocean.
issue [an important problem or subject that people are discussing or arguing about ]
Campaign finance reform was the most important issue in the election campaign.
it [a thing, place, event or idea that is being spoken about ]
The sky is blue, but it also has a few white clouds.