___ myself to my study, I would be sitting in a comfortable office now.
With efforts _______ conservation, we may believe that people enjoy a healthy life without the environment around them ________.
__________ the reason , research shows that laughter is good for your health.
The boy _______to his mother that he had _______ the table for supper and then ____ down to have a rest.
The young lady often makes meals ______ for herself for she is _____ about what she eats.
Price control would gradually disappear ________ a free market.