You will fall behind others _________ you work hard.A. if B. when C. unless
—What time will Diana get to Yancheng? —I’m not sure.When he ______, I’ll call you.
He is kind and always ______ help to others.
My parents promise ______ it to the teacher.
The TV is always ______ at my home.
Miss Liu said ______ she would leave the message on the headmaster’s desk.