The flowers in my room         every day, or they’ll die.

A. must water  B. must be watered  C. should water  D. can be watered

The flowers ________ every day, or they will die.

A. must water     B. can be watered

C. should water    D.must be watered

—The flowers are beautiful. How do you look after them?
—Well, this kind of flowers _________ every morning.
A. should water                B. waters                        C. must be watered