根据以下文章段落的上下文，填写空格。


Do you know how to ride a bike? It's a great skill to have and it's also very good exercise. When you ride a bike, you can go  _____(1) _____(fast) than walking and it's much more fun. You can also explore new places and enjoy the fresh air. However, before you start, it's important to make sure you have the right equipment. First, you need a good-quality bike that fits you _____(2) _____. You also need a helmet to protect your head _____(3) _____ you fall off.
1. faster 
2. properly 
3. if