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". 

[header] How to clean a plastic water tank [title] Open the outlet valve or tap. [step] The first step to cleaning your tank is to empty all of the water from it. To do so, open the outlet valve or tap at the bottom of your tank and let all of the water flow out. <sep> (A) [substeps] You may find that there's extra water in your tank that you need to empty. Read the instructions carefully to see if your water is full enough to remove. (B) You will have to remove several pieces of tank flooring to access one. For the best results, take the steps above. (C) Then, use a bucket to wipe the water down away from the water line, then gently empty the tank contents into the toilet. [substeps] You should also clean the water tank once every few months to keep it clean. (D) [substeps] Connect a hose to the open valve in order to direct the water to a location where it will not cause any localized flooding or erosion. Permanent water tanks have a washout valve that is located at the base of the tank.
D

[header] How to prepare for ielts speaking test [title] Relax and speak as confidently as you can. Candidates who are not able to participate fully in the conversation * may not achieve their potential band score. [step] This may be because they haven't been able to demonstrate the level of language they are capable of producing. <sep> (A) This is why in order to start impressing new people you'll have to start communicating clearly and become relaxed in front of new friends and family. [title] Help the staff in every conversation about the band's. (B) Chances are they have not gotten the chance to have the opportunity to prove themselves. [title] Get to know your supervisors on a regular basis. (C) [title] Learn how the speaking component is assessed : [step] The aim of the test is to assess your ability to communicate effectively. The interviewer considers this ability in four different ways : [substeps] Fluency and coherence: this measures your ability to speak without too many pauses and hesitations. (D) You are simply not strong enough to produce the best sound but must cultivate more. If you are too nervous to speak clearly you'll be able to unintentionally undermine the composition of your speech.
C

[header] How to do research [title] Determine a good reason why this research needs to be done. [step] Clarify who it will help. The answer may be based on your academic, personal or professional needs, but it should be your motivation for doing a thorough job. <sep> (A) [substeps] Someone who finds your work to be fascinating will often work out a plan with you as a test partner. Workplace research should not be something you take lightly and be able to stand by. (B) [substeps] To determine whether a research effort is worthwhile, consider how successful your research is, how in-depth or if your research has an impact on the work that must be done in the future. Try to choose the person who will be doing the work that helps you achieve your goals. (C) [title] Define the problem or question at hand. [step] You should boil the question down to basic terms, time periods and disciplines. (D) [substeps] State whether you are engaged in this research. Any related sources will probably benefit or hinder your research.

C

