His suggestion that a new teaching method ______ to arouse students’ interest in study is necessary.
It was ___ cash that prevented me from joining you at lunch today.
Sorry, I have no time ____ ; I can’t help you right now.
The waterfall can be seen_. Its sound may be heard two miles ____. It looks even more beautiful ____.
. The police were ___ the prisoner to see if he had a gun.
It’s bad manners to call ___.