There was such a long queue for coffee at the interval that we ____ gave up.

It is generally believed that a successful Olympic Games            relies on well-performed IT services.

Wang Ping hesitated for ___ before he ___ to the question.

--People should use public transport instead of their own private cars.--- _______.The roads are too crowded as it is.

Deserts, dry areas with _____ no vegetation, cover more than one-third of the Earth's land surface.