Los Angeles Times reported that researchers may have found a way to ______ human life by changing certain genes, so that humans might expect to live twice as long.
| A．extend | B．preserve |
| C．multiply | D．transform |
Was it ______ the conference of APEC that made Shanghai the focus of the world then?
| A．holding | B．to hold | C．held | D．having held |
The company in Suzhou produced quantities of first-class silk, most of them ____ to Europe.
| A．selling | B．sold | C．were sold | D．are selling |
－Wow! You've got so many clothes.
－Butof them are in fashion now.
| A． | all | B． | both | C． | neither | D． | none |
It_____ have been Tom that parked the car here, as he is the only one with a car. 
| A．may | B．can | C．must | D．should |
The Great Wall istourist attraction that millions of people pour in every year.
| A． |
so a well-known |
B． |
a so well-known |
C． |
such well-known |
D． |
such a well-known |