context: How to clean up a stream
Choose a location.
You should pick a stream that is important to you or your local community and scout it out before hand. You should try to find a portion of stream that is safe and easily accessible by vehicle or foot.
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next sentence for the context: Keep in mind you will be hauling garbage away, it should be easy to get in and out. Try to start small, you don't want to pick somewhere that is too large to effectively clean.

context: How to prevent measles
Speak to your doctor about the vaccination.
The best way to prevent measles is to get vaccinated against the virus. The measles vaccine is 97% effective at preventing measles and works right away.
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next sentence for the context: It is considered very safe for use on children, teenagers, and adults. Speak to your doctor about getting the vaccine if you do not have it already.

context: How to write an essay on how you spent your summer vacation
Look back on mementos you kept from the summer.
If you kept any souvenirs from your summer vacation-like pictures, plane tickets, or a diary-use these to help you with your essay. Looking back on your mementos will help you remember details from your summer, making writing the essay much easier.
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next sentence for the context: These can also make nice visual aids if you are asked to present your essay. Make a list of the things you've done over summer vacation.

context: How to bridle a horse
Check that you have the correct bridle size.
If this is the first time you're using this bit on this particular horse you should be sure that you're using a proper sized bridle. If it's the wrong size it will make the horse uncomfortable.
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next sentence for the context:
Bridles comes in three sizes: pony, cob or arabian, and full. Measure your horse's head from the center of his poll to the corner of his mouth, and compare this measurement to the crown and cheek piece of the bridle.