______I be free tomorrow，I could go with you．

    A．Could    B．Should    C．Might    D．Must

My sister advised me that I _____ accept the invitation.

A．could            B．must             C．should            D．might

Mike       have won the competition easily yesterday, but he gave up．

 A．could         B．might         C．should                D．must

— Linda hasn’t shown up yet.

— It’s strange. She ____.

Tom hasn’t come to work since last Friday,        he have had an accident?

A．Must        B．Should             C．Might       D．Could