Circle the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions

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VII. Circle the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions.

28. The children play in the garden at the moment. They look so excited
A. play B. the C. so D. excited

29. Tuan and Long usually play some games of chess after they finish his assignments.
A. usually B. some C. they D. his

30. The volunteers are working very hardly to keep the community unpolluted.
A. The B. hardly C. community D. unpolluted