四级作文常用词替换

think替换：

单词：maintain、contend、claim

短语：be of the opinion that

            have been convinced that

many替换：

单词：plentiful、numerous

短语：a sea of

            immense amounts of

people、we、us替换：

单词：parents、kids、offspring、businessman

短语：all children and adults

          youngsters and teenagers

          youngsters on campus

very替换：

outstandingly、more than、strikingly

important替换：

significant、indispensable、critical

play a crucial role in sth

人称代词做主语，都可写成被动。