The window _________ a beautiful view out over the river.

The doctor told me that I would recover from my illness if I ______ a healthy diet.

Is that the reason ________he explained to all at the meeting for his carelessness in his work?  Actually we think he is a man who is hard ________ himself especially in work. 

As we all know, every minute ____ full use of ____ our lessons will do good to our students

 Hawking became world-famous in _______.