Generally speaking, my grandmother is nice and kind, but she _______ be very stubborn at times.

The teacher agreed to the suggestion that the students _________ two weeks to prepare for the exam without coming to school.

 Mark     have hurried. After driving at top speed, he arrived half an hour early. 

       I’ve been working all day, but I feel as if I _______ nothing.

 This car looks like mine , yet it isn''t . Whose ____ .