10．The committee is totally opposed ______ any changes being made in the plans.
A．of B．on
C．to D．against
11．It is easy to show that intelligence is to some extent something we are born ______.
A．about B．of
C．to D．with
12．______ evidence shows, for example, that people who lived over three thousand years ago ate salted fish.
A．Ancient B．Historic
C．Historical D．Old
13．Without trees our world ______ a much drier place.
A．is B．will be
C．would be D．must be
14．There are two computers in the office, but ______ is working.
A．either of them B．neither of them
C．none of them D．neither of which
15．It was not a good meal, and Mr. Maydig was describing it sorrowfully ______ Mr. Fotheringay saw his opportunity.
A．as B．once
C．when D．while
16．______, a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of language is poor.
A．Other things being equal B．Were other things equal
C．To be equal to other things D．Other things to be equal
17．As early as 1647 Ohio made a decision that free, tax-supported schools must be established in every town ______ 50 households or more.
A．having B．to have
C．to have had D．havi