It was last Saturday ________ we visited the History Museum.
— I’m sorry to hear that some villagers got disabled in the earthquake.— That’s too bad, but _______.
The Yangtze River, China’s longest, has been affected by a severe drought, ________ the lowest level of rainfall this year since 1961.
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
There was so serious a matter that I had no choice but _________ the police.
The new research team was led by the ________engineer.