IN: Write the next sentence in this paragraph:
How to do a jack knife sit up
Lie flat on the floor with your arms and legs extended.
Your arms should be lifted so that they're above your head. Make sure your spine is in a neutral position so your lower back isn't arched or rounded.

OUT: If you'll be exercising on a hard floor, lay down an exercise mat before you begin. Take a deep breath before you begin.

IN: Write the next sentence in this paragraph:
We see people unpacking a box. the people

OUT: put a bike on a rack.

IN: Write the next sentence in this paragraph:
How to clean exhaust manifolds
Use your owner's manual to locate the exhaust manifold.
4-cylinder engines have one exhaust manifold. 6 or 8-cylinder vehicles have two manifolds.

OUT:
Look for the manifold in front of the engine block on a front-end driven vehicle. Find the manifold on the side of the engine block on a rear-driven.