In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 
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Question: [header] How to know if your dental fillings need replacing [title] Watch for tooth sensitivity. [step] If you have fillings that need replacement, you'll likely feel it first. Paying attention to the physical symptoms of old or decaying fillings can let you know if it's time to have your dentist replace them. <sep> (A) One sign that your fillings may need replacing is if you have tooth sensitivity to temperature, sweets, or pressure. [substeps] Pay attention when you bite into any cold, hot, or sweet foods. (B) Teeth sensitivity occurs when gums become severely stained with white blood. These white discolorations are mainly due to gum disease, but most commonly introduce a white blood cell colony to the side of your mouth. (C) Once your doctor notices an increase in tooth sensitivity, he or she can return you to the dentist. [substeps] Are your teeth hurt or moist? Severe tooth pain, cramping, sensitivity, or tingling are all signs that they need replacement. (D) [substeps] Bad tooth sensitivity is usually not a problem until it gets worse and you start to feel pain. You may experience sensitivity at night and bad teeth at the same time.

Answer: A


Question: He then swings and misses many times. The boy finally gives up and takes the blindfold off. a different woman <sep> (A) joins the procession holding a blindfold in her hand. (B) walks in and stops near the pinata. (C) appears and places it around the boy's eyes. (D) comes and speaks to the camera while the boy continues to throw more balls across the field.

Answer: B


Question: [header] How to make a dynamo easily [title] Find a small hobby motor, those ones with some sort of wheel on the shaft. [title] Mount the motor on like a board or block of wood. [title] Find another bigger wheel and mount it on a pin or something on the same block of wood. <sep> (A) [step] This does not have to be the one that looks like the motor. [title] Choose one brand of motor for speed and keep one brand for durability. (B) [title] Put a handle on the bigger wheel. [title] Then get a rubber band and put it around the two wheels and start turning the handle. (C) [step] Be sure it is at least 2 to 4 " x6 " so when you get back to the original one at your place you are not left with 3 sided wheels which would cost more money. [title] Put the current motor on top of the new one. (D) [title] Put fuel on it for the motor and drive around. [title] Be careful as this is a rock and any force you make will result in a fuel flame/spark.

Answer:
B