【C10】A．mustB．shallC．canD．ought to

She ought to stop work; she has a headache because

You ought to know better than ______ yourself in unnecessary expense.A．to involveB．involve

None of you _______ to stay until the game is over, if you do not want to.A. mustB. ne

【C16】A．mustB．mayC．canD．might

【C12】A．could have setB．should have setC．ought to have setD．need to have set

【C4】A．needB．mayC．shouldD．ought to