I’ll try my best _____ help you.A. on B. to
( ) The White House is in . A. France B. China C. Washington D.C.
( )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; was B. came ;was C. come; is