. Sam ___ some knowledge of the computer just by watching others working on it.
The white building, ______threats to pull it down, is now a private house in the possession of a retired professor.
Everyone doesn’t agree to the plan. Some support it while I’m one of ______ opposed to it.
The two friends ______ on line for three hours, and they will go on.
----Why does Jane always ask you for help?---- There is no one else ________, is there?
Tuhao, dating back perhaps as far as the Southern Dynasty, _________ its new meaning last September.