In a joint statement, leaders from 53 countries said much headway has been made in the past four years. But they also made clear that many challenges remain and stressed the need for increased international cooperation to ensure highly enriched uranium, plutonium and other radioactive substances do not go astray.

Questions:

1. Where did President Xi make his remarks on nuclear security?

2. When did the president leave for France?

3. Leaders from how many countries made a joint statement that said much headway has been made in the past four years?

Answers:

1. At the Nuclear Security Summit in The Hague

2. Tuesday.

3. 53.

About the broadcaster:

Anne Ruisi is an editor at China Daily online with more than 30 years of experience as a newspaper editor and reporter. She has worked at newspapers in the U.S., including The Birmingham News in Alabama and City Newspaper of Rochester, N.Y.

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