( )Our teacher always tells us waste water.
A. to not B. not to C. not
( )We should turn the lights when we leave the room
A. on B. off C. in
( )We shouldn’t cut down trees and waste water.
A. too many ; too many B. too many; too much C. too much; too much
( )I to school when I six.
A. come; wasB. came ;wasC. come; is
( )We are all very pleased our studies in the school.
A. in B. atC. with