16. This experiment turned out to be____failure, but, as we know, success often comes after___failure.
| A．a; \ | B．a; a | C．\; \ | D．\; a |
Choosing to visit the Shanghai Expo on a late afternoon can make you see two to three times as many of the most popular pavilions between 6 pm and closing time ____ you hurry.
| A．when | B．unless | C．where | D．if |
China will have to consider _____ it wants to be viewed by the rest of the world when it exercises its influence as a major power.
| A．when | B．how | C．what | D．which |
Easter Island, which was almost uninhabited when it was discovered on Easter Day in 1722 by a Dutch captain, is covered with hundreds of giant statues, each _______ several tons.
| A．weighing | B．weighs | C．weighed | D．to weigh |
After living in America for over 20 years, Brother Sway said to a reporter the other day, “I ________ done bigger things, had bigger achievements had I stayed in China.” .
| A．must do | B．could do | C．could have done | D．must have done |
The mayor of Zhuanghe City was ordered to resign because of his refusal to ________ when more than 1000 villagers got down on their knees before the city government office building, begging for his help.
| A．break up | B．link up | C．fill up | D．show up |