Chuyển thành câu bị động:
1. People know that he is armed
-> He ..........................................................................................................
2. It is believed that the man was killed by terrorists.
-> The man ................................................................................................
3. People think that the company is planning a new advertising campaign.
-> The company .........................................................................................
4. It is said that there is a secret tunnel between them.
-> There .....................................................................................................
5. They estimated that there were half a million refugees in the camps.
-> There .....................................................................................................