He came to my class every week, but his attitude ______ he was not really interested in the subject.

One way for students to prevent H7N9 flu virus is to open the windows of the classroom to allow the air to ________.

 People in China don’t like hugging each other when meeting, which _________ a common __________ in some European countries.

The committee accepted his proposal that a conference be held _______ to deal with the issues arising in the course.

To our surprise, girls ______ more than half of all the students in the school.