TASK DEFINITION: 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". 
PROBLEM: [header] How to sleep peacefully, and have good dreams at the same time [title] Relax before bed. [step] If you have a hard time getting to sleep, you should take some steps to help you relax and prepare for bed before you want to go to sleep. Spending some time relaxing and clearing your mind can help you to fall asleep more quickly and sleep peacefully through the night. <sep> (A) [substeps] Take a few breaths before bed, if you feel like you may need it. When you feel sleep approaching, take some deep breaths. (B) When you get up in the morning, make sure you have plenty of time to gather your thoughts before bed. Even a quick cup of coffee and some breathing exercises before bed can help you drift into sleep. (C) [substeps] Take a shower and do some light and relaxing activities before bed. If you can, do them before you do anything else. (D) There are lots of different techniques you can try to help you relax before bed, such as : [substeps] Practicing some gentle yoga stretching. Progressively tensing and then relaxing the muscles in your body.

SOLUTION: D

PROBLEM: [header] How to add potassium to an organic garden [title] Mix in muriate of potash or sulfate of potash. [step] Muriate of potash, or potassium chloride, and sulfate of potash, or potassium sulfate, are natural minerals. Muriate of potash tends to be cheaper, but the chlorine it contains can hurt the helpful microbes living in your garden's soil. <sep> (A) Gently mix these two together first, then add the zinc sulfate. [substeps] Zinc sulfate is readily available online, or in desalination solutions. (B) [substeps] You can substitute sodium thiamine (ipsin) or baking soda for sulfate because it is the most acidic fertilizer. Sodium thiamine is a common fertilizer in agricultural and organic gardens. (C) Sulfate of potash is safer, but it's a bit more expensive. [substeps] Check your product's label for specific instructions on how much to add per square foot or meter. (D) [substeps] There are many ways to add potassium to soil: you could use the most common method. You could sift the potassium into an empty feed colander and cool it before dropping it off.

SOLUTION: C

PROBLEM: [header] How to run ubuntu under virtualbox on windows xp [title] Go to the official virtualbox site to download this application. [step] To do click, and in the downloads section, choose your desired release of virtualbox. [title] When the download is finished, click on the setup.exe file. <sep> (A) [title] Download the ip address for the server you installed it on. [title] Download the ip address for the cloud server you installed it into. (B) [title] On the apk page, sign in using your username and password. [step] To create a user account on this page, click " log in " or " log in with username " and you'll be brought to the apk home page. (C) [step] After that, in a new opened window, click on the' next' button. [title] If you wish to change the location of where virtualbox will be installed, you can browse to the location of your choice. (D) [title] After it loads, when it opens name for the setup.exe file, you can choose to edit files/folders. [step] You can also search the import list here.

SOLUTION:
C