Help with education, I'm going crazy?

continued 55.) Which sentence in correctly punctuated? a.) In connection with the tax cut of last year, we are now studying, its impact on middle-income families. b.) Now is the time for all good men, and women to come to the aid of their country. c.) Although the impact on humans is not clear, comput-national problem. (this was my answer) 56.) Which sentence is correctly punctuated? a.) Areas neglected by investors in recent years include real estate and investments in the energy sector. b.) These may not seem as exciting as they did in the past but maybe that's the time to do a little buying. c.) Previous to Webster's complete two-volume edition he had compiled three shorter and incomplete versions. 62.) Harbor Office Supply (note the new address) has ordered ten HP calculators. a.)correctly punctuated b.)replace( ) with -- c.)add , after ORDERED d.)add , after DALLAS and after TEN