In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

We must understand that people can process very little information presented orally. So, it is (1 ) ___________ , particularly for a teacher, to realise that the students have sometimes listened to three or four teachers (2) ___________ you. So, the teacher must have props like notes, handouts and slides that will make the learning material (3) ___________ alive for the students and stay that way with them. A visual aid, a little movement or colour will get the students' attention. Another important thing to (4) ___________ is that long, complicated sentences spoken fast are simply too difficult for students to understand. It is, therefore, (S) ___________ to use short sentences that make sense to them instantly.