We must do whatever we can to ______the river from being polluted any more.
Only after being attacked by the Japanese in Pearl Harbor __________ in the Second World War thoroughly.
In many people's opinion, that company, though relatively small, is pleasant __________.
People suffered __________ from the disaster, but they didn't lose confidence in rebuilding their homes.
-I wonder whom you are waiting for. -The policeman __________ the traffic accident.
-$ 100,but that is my last offer. -__________.