| 1 | But what are those ingredients, and what do they do? | |
| 2 | I do not know why the ceiling should be expected to have that effect. | |
| 3 | Which brings me back to the destructive effect of focusing on invisible monsters. | |
| 4 | They are playing an increasingly important part [role] in safeguarding peace. | |
| 5 | They reappraised the key role of the teacher in the learning process. |
