Directions: Find the part of the given sentence that has an error in it. If there is no error, choose ‘No error’.
Densely occupied rooms and tightly (1)/ sealed buildings are the main causes for (2)/ high levels of carbon dioxide. (3)/ No error (4)
1
Densely occupied rooms and tightly
2
sealed buildings are the main causes for
3
high levels of carbon dioxide
4
No error