Find a mistake in each sentence by circling A, B, C, or D

Find a mistake in each sentence by circling A, B, C, or D.

Question 25. Although careful preparation, they had a lot of difficulties in making the film. 

A. Although                   B. preparation        C. had                          D. difficulties

Question 26. The characters in the book were so convinced that I was shocked when one of them died. 

A. The characters           B. convinced          C. shocked          D. them

Question 27. Carbon footprint is about the positive effect we have on the environment.         

A. Carbon                     B. is                      C. positive            D. on

Question 28. The old man walked home by himself  in spite of he knew that it was  dangerous.   

A. home                         B. himself             C. in spite of        D. was

Question 29. At this time tomorrow, the students do maths exam in my school. 

A. this time                    B. the                      C. do                  D. in