.Unfortunately, when I dropped in, Doctor Li _____ for Qinghai to join in the fight against the earthquake, so we only had time for a few words
If one of the computers ___, the whole networks would be unable to work.
After the fire ___ in the shop, Tom ___ the manager.
Thousands of foreigners were ___ to the Shanghai World Expo the day it opened.
In communication, a smile is usually ___ strong sign of a friendly and ___ open attitude.
I remembered ___ the door before I left the office, but forgot to turn off the lights.