Choose the word (a, b, c, or d) that best fits each of the blank space

Choose the word (a, b, c, or d) that best fits each of the blank spaces. Our classes take place (Question 21) ___ three hours every morning (Question 22) ___ Monday to Friday. The maximum class size (Question 23) ___ twelve and the average is ten. We use modern methods of teaching and (Question 24) ___ and the school (Question 25) ___a language laboratory, a video camera and recorder. You will only be (Question 26) ____ in improving your English, however, if you work (Question 27) ______ and practice speaking English as (Question 28) _____ as  you can! Question 21: