Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.

The Fitbit Flex is a mobile device aimed at planning your exercise, diet, and sleep. It’s very easy to wear it all the time. It is very light and comfortable, and it looks casual and natural on your wrist. When I need to wear a watch, I have one that sits (1)...............the Flex quite easily. You can get different Fitbit Flex wristbands. Reasaonably priced, with dozens of fun colors!

I was pleasantly surprised to learn how many steps I walk during my normal working day. I actually find ways to fit in even more activities (2)..................., so I can watch the numbers go up. It’s water – resistant, so I can wear it in the shower or in the rain without worrying about keeping it dry. The Fitbit synchronizes with my smartphone via Bluetooth.

Tracking food items (3)....................it possible for the Dashboard to display a calorie budget for you, comparing calories consumed versus calories burned. It will use the daily calorie total you create to show you how many calories left in the day.

While I’m sleeping, the Fitbit Flex measures the movements of my wrist, logging my sleep (4)...............awake, restless, or asleep. It has been fascinating to see my sleep pattern each night and over time.

There is a notification alert to let me know when my battery is running low. After 10 minutes or so in the charging cable, it’s good to go again. The Fitbit Flex battery needs (5)...................every 3 to 5 days.

When I need to wear a watch, I have one that sits (1) ________the Flex quite easily.