—George, ___    _ you sing so loudly at such a late hour?

—I am terribly sorry．

A．will            B．may            C．must           D．shall

She searched all the places where she _____ have left her necklace but it was all in vain.

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

Don’t interrupt me ,John．       you force me to tell you the truth at the moment?

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

He is free now, so he ______ go with us, but he hasn’t decided yet．

A．shall        B．must          C．may        D．will

You ______ use my bike on condition that you give it back to me before I leave here．

A．should         B．must         C．ought to         D．shall