In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

[EX Q]: Article: Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend themselves by using both physical and chemical means. Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach. Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal's teeth. Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar. Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly leaves, and each prickle contains poisonous venom A single experience with this kind of plant will teach an animal to stay away from it in the future.
Answer: physical means
[EX A]: To defend themselves, oak trees use _ .

[EX Q]: Article: I was an introvert by nature. For as long as I remember, showing a sincere smile when meeting someone had never been easy. When meeting people, instead of being excited, I often felt upset or self-disturbed. But we all know having friends is important. The more friends you have, the more opportunities you get, no matter whether it's a job opportunity, a romantic relationship, or a business partner. So a smile is important to making others feel comfortable. Mother Teresa said, "Every time you smile at someone, it is an action of love, a gift to that person and a beautiful thing." The smile I'm talking about is not to make a face to someone. I'm talking about those wide smiles you make when meeting old friends. So I've discovered a trick. I call this technique "Oh, it's Jamie!" When I meet someone, I imagine him as an old friend of mine called Jamie. He was my first friend when we were still kids. It's no secret why my smile is as wide as I can possibly make. And the best part, whenever you're friendly to others, they are friendly in return. You're not hearing this from me. A research which was done early by scientists actually backs this claim. So do remember to give it a try.
Answer: very difficult
[EX A]: According to the author, showing a sincere smile is _ .

[EX Q]: Article: The quality of patience goes a long way toward your goal of creating a more peaceful and loving self. The more patient you are, the more accepting you will be of what life is, rather than insisting that life be exactly as you would like it to be. Without patience, life is extremely frustrating. You are easily annoyed, bothered, and irritated. Patience adds a dimension of ease and acceptance to your life. It's essential for inner peace. Becoming more patient involves opening your heart to the present moment, even if you don't like it. If you are stuck in a traffic jam, late for an appointment, being patient would mean keeping yourself from building a mental snowball before your thinking get out of hand and gently reminding yourself to relax. It might also be a good time to breathe as well as an opportunity to remind yourself that, in the bigger scheme of things, being late is "small stuff". Patience is a quality of heart that can be greatly enhanced with deliberate practice. An effective way that I have found to deepen my own patience is to create actual practice periods--periods of time that I set up in my mind to practice the art of patience. Life itself becomes a classroom, and the curriculum is patience. You can start with as little as five minutes and build up your capacity for patience over time. What you'll discover is truly amazing. Your intention to be patient, especially if you know it's only for a short while, immediately strengthens your capacity for patience. Patience is one of those special qualities where success feeds on itself. Once you reach little milestone --five minutes of successful patience--you'll begin to see that you do indeed have the capacity to be patient, even for longer periods of time. Over time, you may even become a patient person. Being patient will help you to keep your perspective. You'll see even a difficult situation, say your present challenge, isn't "life or death" but simply a minor obstacle that must be dealt with. Without patience, the same scenario can become a major emergency complete with yelling, frustration, hurt feelings, and high blood pressure.
Answer: a matter of life or death
[EX A]:
People without patience will treat the challenge as _ .