A A class focused exclusively on the mechanical repetition of dialogues (speaking) without students understanding the meaning of what they are saying.
B A writing exercise (writing) that involves only copying grammatical sentences from the board into the notebook, without any original production.
C A reading test (reading) that consists only of translating isolated words, without checking overall text comprehension.
D A project in which students read (reading) short articles on a topic, discuss (speaking/listening) in groups, and finally write (writing) a short opinion paragraph.