instruction:
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". 
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:
[header] How to do indian meditation [title] Sit on the floor or in a chair. [step] Find a place where you can sit comfortably for at least ten minutes. It could be indoors or outside. <sep> (A) You could even wear the same socks or wear the same footrest. Although there are many practicing yoga, it is not truly necessary to practice it. (B) Don't meditate in a bad home, as, your home will be home to a chronic and pushy person, and it will likely get tired again. [substeps] If you can, find a warm place that will allow you to sit comfortably for at least 30 minutes, preferably in a room that is not hot or stuffy. (C) [substeps] You could also hold a prayer or light candle. If you can't find a comfortable place in your home, try reading a magazine or doing a search for guided meditation websites. (D) What matters most, however, is that it is quiet and free from distracting noise like music, television, or people talking. [substeps] Not all noise is bad in the vipassana tradition.
answer:
D


question:
The man begins speaking to the camera while showing the razor and its various parts. Soon he begins shaving his face while looking in the mirror. afterward <sep> (A) , he applies shaving cream all along his face with a hair razor. (B) he begins shaving his goatee and the front of his head, alternating between shaving with his hand and shaving the side. (C) he is shown blowing kisses at the camera. (D) , he resumes speaking to the camera and showing how the razor performed.
answer:

D