—Tom must be at home because the light in his house is on.

—He ____ be at home, because I saw him playing basketball on the playground.

A. must B. can’t C. mustn’t

He _____ be at home, because the light is on.

A．must             B．can’t            C．can              D．might

Today is Wednesday. He _____ be at home. He _____ be at school.

A．can't; can         B．can't; must         C．mustn't; must      D．mustn't; can

 Today is Wednesday. He _______be at home. He _______be at school.

A. can't; can                                                          B. can't; must

C. mustn't; must                                                      D. mustn't; can