The results of this research are still in the verification stage.

This is the most difficult case I have ever faced.

He got involved in a love affair.

The Tiananmen Square incident is an important event in Chinese history.

The Marco Polo Bridge Incident was the trigger for the Sino-Japanese War.

We need to conduct a factual investigation on this issue.

We went to the scene for fact-finding.

We conducted a questionnaire survey for the development of new products.

When will the next national census be conducted?

The next census will be conducted next year.