The most popular_____ transportation are bikes and buses.[ ]

The children felt _________ because of the _______ result of the football match.

All the students in Class 5 will climb the mountain if it _______ rain tomorrow.

______ free education, the poor children in our hometown can go back to school.—So can the poor children in our hometown.[ ]

Is the man standing outside the teacher’s office Mr. Zhou? –No, it ______ be him. He has gone to Hong Kong for an academic conference.