1.        Einstein’s famous E=mc2 formula theorized that transforming a small amount of mass would release an enomous amount of energy .fficeffice" />

    Einstein’s famous E=mc2 formula theorized that converting a small amount of mass would release an enomous amount of energy .  Which is better? Why?    P7

2.   T                 That alone would have been enough to secure his reputation in history. Yet   he  published work on critical opalescence which answered the age-old   question  of  why the sky is blue.

     C                  Can yet be used here? Is it mean “and”  here?  P7

4．   Inflation is a period of increased spending that causes rapid rises in prices.   Inflation is a period of increased consuming that causes rapid rises in prices. Which is correct?  P18

5．   Inflation is a period of increased spending that causes rapid rises in prices. Since your money buys fewer goods so that you get less for the same amount of money as before, inflation is the problem.     Can I use “since” here meaning “because”?  P18