Tomhasbeenavegetarian____principleforyears.
A、inB
【句意】 多年来，汤姆一直是一个按原则行事的素食者。
【难点】 on principle意为“根据行为准则;按照原则”;in principle 意为“原则上;基本上;大体上”。for和by不与principle搭配。
Mr. Green is used to_________ two apples after lunch every day.
As ____ clear from his manners, he is a teacher.
______hardworkitis!
Physics is the present day equivalent of ____ used to be called natural philosophy, from ____ most of present day science arose.
Theforeigners_________there,butthey_________thefoodthereatfirst.
