Mohon bantuannya choose the correct answers1. Greg : I think I saw Bigfoot crossing the street in front of me last night, but I’m not sure
Tom : You ______ seen a big bear
A.must have
B. might have

2. there’s no evidence or research confirming the age of the artifact yet. It _________ been from the medieval era
A.may have
B. must have

3.Scientist are still debating about how the stones were moved to build the pyramids in Egypt. Some believe that the pyramid workers ___________ pushed and rolled the stones.
A.must have
B. may have​