Writing SAT: Questions: Plz help

Test Preparation
1

<p>IN THE blue book,
pg. 480 #7
<>--underline part
Social scientists <agree that=""> a system <for exchanging=""> goods and services is not only present but also <of necessity=""> in all socities.</of></for></agree></p>

<p>Why is the answer <of necessity="">?
What's the difference between a necessity and of necessity?</of></p>

<p>pg 470 #9
In <those cities=""> <in which=""> public transportation is adequate, fewer traffic problems occur and pedestrians <are rarely=""> <involved in=""> accidents.</involved></are></in></those></p>

<p>Is it a litlte excessive to say "in those cities.."in which" "</p>

2

<p>For the first one, it should just be necessay, to make it parallel with present.</p>

<p>I don't know about the second one.</p>

3

<p>for the first question I'm not sure but I think u must have parallel structure u cannot use "of necessity" here cauze "present" is an adjective. It should be necessary</p>