Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 18 to 22. 

EXAM ADVICE

In Part Three of the Speaking Section you work together with a partner. You have to do a (18) ________ task which usually lasts about 3 minutes. One possible task is “problem solving”, which means you have to look at (19) _________ visual information and then discuss the problem with your partner. You may be shown photos, drawings, diagrams, maps, plans, advertisements or computer graphics and it is essential that you study them carefully. If necessary, check you know exactly what to do by politely asking the examiner to repeat the instruction or make them clearer.

(20) ________ you are doing the task, the examiner will probably say very little and you should ask your partner questions and make (21) ________ if he or she is not saying much. If either of you have any real difficulties, the examiner may decide to step in and help. Normally, however, you will find plenty to say, which helps the assessor to give you a fair mark. This mark depends on your success in doing the task by competing with your partner, (22). _______ includes taking turns in giving opinions and replying appropriately, although in the end it may be possible to "agree to disagree”.