_______ he met with the difficulty did he realize the importance of our help.
| A．Never until | B．Even though |
| C．Until when | D．Ever since |
. Don’t leave your keys in the car. Someone might steal ________ .
| A．one | B．that | C．this | D．it |
we can avoid _________ with rest and a balanced diet.
| A．ill | B．to get ill | C．getting ill | D．be ill |
Expo 2010 Shanghai China __________ on both ba{007}nks of the Huangpu River in the city of Shanghai, China, from May 1 to October 31, 2010.
| A．is being held | B．is holding | C．will hold | D．holds |
. The farmers were more anxious for rain than the people in the city because they had more ______.
| A．at length | B．at last | C．at stake | D．at most |
As is often pointed out, knowledge is a two-edged weapon which can be used ______ for good or evil.
| A．similarly | B．widely | C．equally | D．properly |