context: How to buy turquoise jewelry
Learn the difference between real turquoise and imitation turquoise.
Natural turquoise, an aggregate of copper aluminum phosphate hydrate, formed under heat and pressure, is often soft or porous when mined. The various colors found in turquoise result from the presence of either copper or iron--vivid blue is from copper and the softer green tones from iron.

OPTIONS:
- Unlike real turquoise, fake turquoise also has copper elements placed in the surface. Know the difference between fake turquoise and pure turquoise.
- Pure turquoise requires plenty of organic matter. Real turquoise, however, requires constant sunshine and chlorine.
- Turquoise stones can also have patterns of brown, yellow ochre and black matrix, produced from copper compounds. True turquoise has an opaque, waxy luster that may or may not include matrix, depending on the type of turquoise.
- Matching turquoise necklaces are very closely connected. A real turquoise necklace consists of both copper and iron, while a fake turquoise has iron and copper symbols which represent the same materials.
****
next sentence for the context: Turquoise stones can also have patterns of brown, yellow ochre and black matrix, produced from copper compounds. True turquoise has an opaque, waxy luster that may or may not include matrix, depending on the type of turquoise.

context: How to get healthy gums
Brush your teeth for two minutes twice a day.
This is the number one step you can take to care for your teeth. Using a soft or medium bristle toothbrush and fluoride toothpaste, be sure to brush in the morning and evening every day.

OPTIONS:
- Set a timer for two minutes or listen to a short song to keep time. Don't " scrub " your teeth hard-hold the brush like a pencil and brush in light circles and vertical strokes which will prevent gum recession.
- Brushing will encourage blood to circulate in your mouth and break up the bacteria on your teeth; this also helps prevent you from developing cavities. Gums are also integral to food and hygiene, as they help curb calcium, which can lead to cavities.
- Brush the top teeth first, and then move to the rest of your teeth. This will keep your mouth healthy and prevent cavities.
- Brush before you go to bed each night, and after breakfast. Brush your teeth when they are most fresh and clean.
****
next sentence for the context: Set a timer for two minutes or listen to a short song to keep time. Don't " scrub " your teeth hard-hold the brush like a pencil and brush in light circles and vertical strokes which will prevent gum recession.

context: A jump runner warms up before going in for a long jump. he

OPTIONS:
- lays in the sand and prepares for the jump.
- runs and does some normal stuff before jumping again.
- goes to the weight bar and sits, spinning his body into several mistakes while landing.
- does the long jump, then immediately hops up and runs back, cheering and celebrating with the crowd.
****
next sentence for the context: does the long jump, then immediately hops up and runs back, cheering and celebrating with the crowd.

context: How to reset a blackberry
Open the battery cover on the back of the blackberry.
Remove the battery from the phone.
You can perform a hard reset on the blackberry z10 by pressing and holding the power button on the top of the phone for about 10 seconds.

OPTIONS:
- Reinsert the battery after a few seconds. To be on the safe side, wait for up to 30 seconds and then reinsert the battery into the back of the phone.
- A worksheet will display on-screen with instructions on how to reset the phone to factory settings. Press and hold the power button on the blackberry z10.
- Insert the usb battery cartridge back into the phone. The battery tray is in the middle of the phone.
- Remove the battery from the back of the phone. You can remove the battery in any position you can without damaging the bluetooth features.
****
next sentence for the context:
Reinsert the battery after a few seconds. To be on the safe side, wait for up to 30 seconds and then reinsert the battery into the back of the phone.