Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 21 to 25.

It is hard to imagine life in modern society (21)             smartphones. These handy little devices keep us entertained and enable us to manage important tasks on the go. Although smartphones feature powerful hardware, they wouldn’t be so useful without thousands of handy applications. Here are a few free and helpful apps that you can download to help you throughout the day.

If you have a habit of forgetting things and want to organize your life, give Evernote a try. It promises to help users remember everything. With a few clicks, you can send all of your photos, documents, and audio notes to Evernote. Then, your (22) _____ information can be stored in folders or tagged with useful keywords. When you need to access this data, you can perform a simple search and it will appear in seconds. SoundHound is (23) _____ that enables users to quickly identify songs by (24) _____ the app and holding their phone in the air. The app takes the song playing and compares it to thousands of other songs until it finds a match. Within seconds, it can tell you the name, artist, and album of the song you just heard. (25) _____ spectacular app is Lookout. Hopefully, you won’t have to use it often, but when you do need it. Lookout can be a lifesaver. Its main function is to help you find your phone if it goes missing. Lookout does this by using your smartphone’s data connection to locate your lost device.

It is hard to imagine life in modern society (21)             smartphones.