1. When our national security is at stake, we must do everything we can to restore peace.2. Working as a construction worker, he puts his safety in jeopardy every day.3. Working as a construction worker, he puts his safety at risk every day.
 at stake in jeopardy at risk這些片語都有「受到威脅」的意思，都是正統美語，非常好用。
老師 (讓小朋友出校車後): 別嬉戲，別跟陌生人說話。 (請填空)
Teacher (after letting kids out of the school bus on a field trip): No horeplay. Don't talk to strangers.