Abstract-There is no doubt choosing specific language teaching materials can influence the quality of teaching and learning procedures. The textbooks can often play an essential role in students' success or failure as a part of the materials used in the language classrooms. Consequently, special care should be taken in evaluating educational materials based on dependable and valid instruments. Some of the usual instruments to evaluate the English Language Teaching materials are the checklists. An evaluation checklist is an instrument that allows the evaluator with a number of features of successful teaching and learning materials. Regarding this, the present study is an attempt to evaluate the recent general English textbook by Richards and Bohlke (2012) titled "Four Corners" using Daoud and Celce-Murcia's (1979) evaluation checklist. The finding of the study supports the strengths of the aforementioned textbook putting it in one of the reliable available textbooks.

Abstract-Lexical inferencing denoted a process of guessing the meaning of an unknown word by employing all linguistic cues available in the text together with the reader's world knowledge, his/her linguistic knowledge, and his/her awareness of the context. ( Haastrup, 1991).This study dealt with exploring the influence of number and density of unknown words on lexical inferencing. To this end, different data collection devices were used: A Quick placement test given to 90 students to select 30 same English proficiency level students for this study, a text with high density of unknown words including 357 words totally and 20 unknown words and a text with low density of unknown words including 291 words totally and 10 new words were given to the participants to show the effect of number of new words on success of learners' lexical inferencing. The guessing success of the students in the texts with low density of unknown words interpreted that the lower the number of unfamiliar words, the higher the available clues for the participants to use for inferring the correct meaning of those words. The results can be of significance to teachers and learners of English. Index Terms-lexical inferencing, number of lexical items, reading comprehension