1. The king and queen (could have killed/could have been killed) by
the invaders.
2. The notebook has Tracey's name on it. It (must/might) be hers.
3. The treasure (must/might) be hidden in the mountains, but
archeologists haven’t found any evidence of it yet.
4. Benro is on vacation overseas with his family now, so he
(couldn’t/could) have been at the movie theater yesterday.
5. No one knows where Genghis Khan is buried. There is a possibility
that he (could/must) be buried in the Forbidden Zone in Mongolia.
1. The king and queen (could have killed/could have been killed) by
3. The treasure (must/might) be hidden in the mountains, but
archeologists haven’t found any evidence of it yet.
4. Benro is on vacation overseas with his family now, so he
(couldn’t/could) have been at the movie theater yesterday.
5. No one knows where Genghis Khan is buried. There is a possibility
that he (could/must) be buried in the Forbidden Zone in Mongolia.
