Only when he failed ______ the stress he was under.
The doctor suggested ____ sent to the hospital.
---Where did you see the movie Life of Pi directed by Ang Lee?---- It was in the cinema ________ I regularly go .
__________ in the leg made it impossible for me to walk as fast as usual.
As we all know, every minute _____ full use of ____ our lessons will do good to us students.
The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.