A. Community service works you do for the benefits of the community.

B. Community service is the work you doing for the benefits of the community.

C. Community service is work you do for the benefits of the community.

D. Community service is the work you do for the benefits of the community.

A. This room should be cleaned every day.

B. This room should been cleaned every day.

C. This room should clean every day.

D. This room should be clean every day.

A. Bicycles must not be left in the hall.

B. Bicycles in the hall must not being left.

C. Bicycles in the hall must not left.

D. Bicycles must been not left in the hall.

A. Last summer I provide English evening classes for twenty children.

B. Last summer I provided English evening classes for twenty children.

C. Last summer was I provided English evening classes for twenty children.

D. Last summer I was provided English evening classes for twenty children.

A. My mother often donates money to charitable organizations.

B. My mother often donate money to charitable organizations.

C. My mother often donated money to charitable organizations.

D. My mother often donatees money to charitable organizations.