Choose the word that differs from the other three in the position of primary stress.

Choose the answer to fill in the blank in each of the following questions.

Read the following passage and choose the correct answer that best fits each of the following blanks.

UFOs, or Unidentified Flying Objects, have fascinated people for generations. When people see something strange in the sky, they often wonder if it could be a UFO. Many times, these sightings have simple explanations. Sometimes people (14) __________ ordinary things like airplanes, drones, or even birds for UFOs. Other times, natural phenomena like clouds or meteors can create unusual shapes in the sky, leading to confusion.

However, there are some sightings that (15) __________ mysterious. One famous sighting happened in 1947 when pilot Kenneth Arnold saw nine strange objects flying near Mount Rainier in Washington State, USA. He (16) __________ them as shiny and moving like “saucers skipping on water”. Some people thought they were secret military tests, (17) __________ others believed they might be visitors from another planet. Despite lots of investigation, the objects couldn't be identified. This event caused widespread interest (18) __________ UFOs, and since then, countless sightings have been reported worldwide. These sightings keep us wondering what (19) __________ be out there beyond our understanding.

Complete the second sentence so that it has the same meaning as the first one.