A UFO means an “unidentified flying object”. It is something in the sky that a person cannot explain at first. People have reported strange objects in the sky for hundreds of years, but the term “UFO” became popular (1) _________ the 20th century. One famous modern sighting happened in 1947, when (2) _________ American pilot named Kenneth Arnold said he saw nine unusual objects flying very fast near Mount Rainier. After that, many newspapers began writing about “flying saucers”. In the same year, the Roswell incident in New Mexico also made UFO stories more famous around the world.

Since then, thousands of people have reported seeing UFOs in different countries. Some think they are spaceships from other planets (3) _________ others believe they are weather balloons, aircraft, or natural events. Governments and scientists have also (4) _________ certain cases to find clear answers. Most sightings can be explained, but a few still remain a mystery. That is why UFOs continue to (5) _________ many people today.

1. Zoom Workplace, usually called Zoom, is a video meeting programme made by Zoom Communications. The first version of Zoom was launched in 2012, and it could only support 15 video participants at the time. Now, Zoom's free plan lets up to 100 people join at the same time, but meetings can only last 40 minutes. Users can pay for a higher plan, and the biggest plan allows up to 1,000 people in one meeting for as long as 30 hours. Many users express their preference towards Zoom as it allows recording the meetings for free, unlike other video conference apps like Google Meet.

2. When the COVID-19 pandemic began, Zoom gained 2.22 million users by February 2020. During the pandemic, Zoom was used much more for remote work, online learning, and communication. In 2020, it became one of the most downloaded mobile apps in the world, with over 500 million downloads. As of April 2020, Zoom had more than 300 million daily meeting participants.