1.   And yet, in public at least, the upper lip remains ever stiff.

2.   But the penalties remain stiff if the visitor gets caught past the border.

3.   Delta, however, warned that airline competition remains stiff and said it still has to aggressively slash expenses to return to sustained profitability.

4.   Mixture will remain stiff.

5.   The water-glass design allowed the building, while flexing slightly at each floor, to remain remarkably stiff.