cef: b1+toefl: 100collins cobuild key words for the toefl test supports learners of american english who plan to take the toefl exam.feel confident that you have mastered the vocabulary you need for a top toefl test score. expand your vocabulary using the a-z section revise from word lists organized by test topics understand the meaning of words through clear definitions express yourself clearly using collocations and phrases see how english is really used with collins corpus examples prepare for the exam using helpful language boxes