(Direction 21-25): Look at the given picture carefully and complete the paragraph by choosing the most appropriate conjunctions:This is the picture of a classroom. There is a chair __21__ a table for the teacher. A student is cleaning the table __22__, the other is cleaning the blackboard. All the four students are working, __23__, there is no teacher in the room. Their classroom looks good __24__ they clean it daily. The principal __25__ the teacher are happy with the students.

• A. or
• B. and
• C. but
• D. though