question: Complete the next sentence:

The bikers are going over a curbed surface at full speed. There are several other bikers doing the same activity on another curved surface. there
OPTIONS:
- are five bikers wearing helmets standing ready to start a race.
- are several other spectators kneeling on the curbs helping the group go over the top.
- is a further change of event.
- 's also a bull in a snowy area.

answer: are five bikers wearing helmets standing ready to start a race.

question: Complete the next sentence:

How to choose an air purifier
Deep-clean your living space.
If there's dust lurking in your living space, it will make your need for an air purifier seem more dire than it actually is. Vacuum regularly, including furniture, and check your heating vents for lint and dust.
OPTIONS:
- Wash your windows and doors well whenever you can. When looking for a new air purifier, consider : Personal preference.
- Dust that doesn't reflect light well can negatively affect your air purification or improve the quality of your air. Use a vacuums vacuum or a vacuum hose with long-nozzle appliance attachments to suck up dust.
- If you still feel like you'd breathe easier with cleaner air, then you can start doing research on an air purifier. Determine why you need an air purifier.
- If dust is common, tap the sofa to blow it out. Cleaning bedrooms and taking it to the dry cleaners regularly will give you results that expand the storage capacity of your house without increasing dust counts.

answer: If you still feel like you'd breathe easier with cleaner air, then you can start doing research on an air purifier. Determine why you need an air purifier.

question: Complete the next sentence:

How to tail whip
Practice your jumps and airing out.
To do a bmx tail-whip, you'll need some serious air. It's hard (though not impossible) to tail-whip from the ground, so practice on a quarter-pipe or other jump that you can get up off the ground high enough to whip the bike around safely and have a chance of landing it.
OPTIONS:
- Practice getting big air and turning around clockwise to aim forward as you land. One good exercise when you're trying to learn is to kick off your far leg.
- Get a friend, private instructor, or whatever you can get your hands on to give you some practise. Another thing to work on before you try a tail whip is to practice at your own speed.
- To execute your tail-whip, take a deep breath and move your body in the opposite direction as if you were making a u shape. Lower your left foot and slide the right around on the ground.
- This will give you the smoothest ride on the bike. If you can land a great backkick, you won't need to practice nearly as hard as if you lacked air.

answer:
Practice getting big air and turning around clockwise to aim forward as you land. One good exercise when you're trying to learn is to kick off your far leg.