The NBA is _____ organization of professional（职业的） basketball players in the USA.
A. a B. an C. the D. /
Nowadays, many parents are trying to either prevent their children from failure, or protect them from the knowledge ______ they have failed.
| A．when | B．where | C．what | D．that |
Last year alone, the temporary unemployment insurance lifted 2.5 million people out of poverty, and ________ the blow for many more.
| A．corrected | B．cushioned |
| C．compensated | D．corresponded |
___________the many ways illegal immigrants come into the United States every year, the vehicle crammed with crowds seems to be the method of choice lately. However, tragedies such as deaths on the journey to the destination, are sometimes reported nowadays．
| A．In | B．For | C．Of | D．On |
Not giving up when meeting with difficulties is a good quality, ______ you can benefit from.
| A．what | B．that | C．one | D．the one |
You can stay there for as long as your supplies of food and water can ________.
| A．hold up | B．hold on |
| C．hold back | D．hold out |