___________ the earth to be flat, many feared that

___________ the earth to be flat, many feared

______ the earth to be flat, many feared that Columbus would fall off the edge of the eart

______ that the earth was flat？A．Used it to be thoughtB．Did it used to be thoughtC．Was it

Many reporters hurried to the airport, ______ that the superstar had already left.A．had be

Some conservationists fear that many endangered species will not be valued because ______.

Until the 16th century the earth______to be flat.A．is believedB．has been believedC．believe