Hey there. Welcome to the Question of the Day, which will be continuing. Sweet. For any word lists up to February, the Word List for the subject will still be available. After February, the word lists are for members.
Next months subjects are Onsen Etiquette, Kawaii lunchboxes, and the Anonymous Hacker Group. The videos will be released tomorrow, and will always be there for you to watch. If you watch them on a computer, example sentences will be in the top right corner of the screen.
Enough. Today's question:
a：The price of goods now compared to 20 years ago is sometimes hardly comparable.
b：If something is scarce, it will begin to command higher levels of demand, and price.
c：Once the painting's validity was confirmed, it became a very valuable piece of art.
d：Fresh water is still free, but in the future it may become a commodity.