1¡¢Days later, my brother called to say he was all right, but ________ say where he was.

A. mustn’t    B. shouldn’t    C. wouldn’t    D. mightn’t

2¡¢The manager was concerned to hear that two of his trusted workers                 .
A.will leave    B.are leaving    C.have left    D.were leaving     

3¡¢At college,Barack Obama didn’t know that he__________ (become) the first black president of the United States of America.

4¡¢Samuel,the tallest boy in our class,__________easily reach the books on the top shelf.

5¡¢—Can’t you stay a little longer?

—It’s getting late. I really ____________ go now. My daughter is home alone.