People must not leave bicycles in the hall.

A. Go Green is a non-profit organization that protects the environment.

B. Go Green is a non-profit organization that protect the environment.

C. Go Green is a non-profit organization that protecting the environment.

D. Go Green is a non-profit organization that protects environment.

A. You need to patient and caring when taking care of pets.

B. You need to be patient and caring when taking care of pets.

C. You need be patient and caring when taking care of pets.

D. You need to be patient and caring when take care of pets.

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. You are an volunteer if you help other people willingly and without payment.

B. You are volunteer if you help other people willingly and without payment.

C. You are a volunteer if you help other people willingly and without payment.

D. You are volunteer if you helped other people willingly and without payment.

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. 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.

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.