My newly- purchased bag is nowhere to be found.____ I have left it on the bus?

Jim. You are late again.  ---   sorry. I___   next time.

 —Whose book is this? —It _____ be Mary’s. Mo Yan is her favorite author. —No, it ____ be hers, she never brings novels to school.

Jenny doesn’t agree with her father, but she ________ that to his face.

—______ I take the magazine away from the reading room?— No, you mustn’t. You ______ read it only here.