What are the answer choices?
Mistakes are a key part of discovery. If we didn't make mistakes we would never know the difference between right and wrong whether it is in science or in life. How would we know how the world worked without mistaken theories and learning off of those to create a correct understanding of the world around us. If we didn't make mistakes with the people we know and care for then we wouldn't have created the definition of the golden rule. Mistakes are the key to discovery in so many things. There is so much unknown but with our mistakes, we will be able to find out so much more
Answer A makes sense for me
the other sentence is B therefore
because therefore means so
my teacher was very ill therefore (so) a substitute was called to finish the day
The answer is B. One of the most basic operations in glasswork is breaking glass to a desired length.
Options A, C and D do not make sense grammatically.
