We should have our schools swimming pool cleaned before the summer begins because it is looking dirty.

A. Our school's swimming pool should be cleaned regularly because of its  dirtiness.

B. We should clean our school's swimming pool at the beginning of the summer because it is looking dirty.

C. We had better get our school swimming pool cleaned before the summer begins because of its dirtiness.

D. Due to the impurity of our school swimming pool, we should have someone clean it as soon as possible.