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

—I am terribly sorry．

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

The traffic is heavy these days．I ______ arrive a bit late, so could you save me a place?

A．can        B．might           C．need            D．must

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

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