I think its going to be the 2nd option class's. even the you usually put an apostrophe after the s when the noun is plural, I believe class's is a collective noun in this place which take a singular approach with apostrophes
Answer:
laboratory experiment is an experiment conducted under highly controlled conditions (not necessarily a laboratory), where accurate measurements are possible. The researcher decides where the experiment will take place, at what time, with which participants, in what circumstances and using a standardized procedure.
Answer:
i play tennis, and before a match it's customary to practice with your opponent. it gives you a chance to see how to the other player plays the game. plus if you're practicing it's not competitive, it's cooperative. so you aren't trying to beat each other at practice.
<u>Paragraph introducing myself as the merchant in the Canterbury tales:</u>
I am the merchant from the Canterbury Tales. Of course, I am sure that you can tell that from my attire consisting of this multi color cloak and beard. I am someone who is well versed in the money exchange and because of that, I have been hired by many successful businessmen in the country. I also well versed in the fields of financial and business matters to the extent where, I am present in almost all of the business meetings that takes place in the town.