Rewrite the following questions in reported speech, using question words before to-infinitives. 1. "When should we start our campaign?" →They had no idea....... 2. Mom, who should I call upon arriving...

Here are the rewritten questions in reported speech, using question words before to-infinitives: 1. They had no idea when to start their campaign. 2. Trung asked his mother whom to call upon arriving at the airport.