When he is faced with a dilemma sometimes, he usually makes a/an ________ decision by throwing a coin.
| A．arbitrary | B．conservative | C．accurate | D．cautious |
__________ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
To their __________, young people in China, ignorant about Chinese traditional holidays, are crazy about Christmas or Valentine's Day.
| A．enjoyment | B．satisfaction |
| C．astonishment | D．relief |
__________ encouraged me most at that time was the comments of the teachers and my friends.
| A．Who | B．What | C．Which | D．That |
His modest business eventually __________ into a supermarket empire.
| A．expanded | B．attained | C．attached | D．switched |
We went to the Lincoln Memorial yesterday, which was __________ with visitors from all over the world.
| A．common | B．mixed | C．full | D．crowded |