We must ______ that the experiment is controlled as rigidly as possible.
A、assureA
暂无解析
________ they've got to know each other a little better, they get along just fine.
Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
Theterriblenoiseis______memad.
Sixty per cent of television viewers chose him as their _______ actor.
Attendanceatfootballmatcheshave_____sincethecomingoftelevision.
