—Why are you so nervous?
—To our great surprise, we found by the strangers.
| A．we monitored | B．ourselves monitored |
| C．us to monitor | D．ourselves monitoring |
A girl became a writer at ___ age of 12,_____ age when many children are still in the primary school.
| A．an;an | B．the;an | C．an;the | D．the ;the |
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 |