As the ________ of Thomas Edison shows, a child who typically questions the most common facts may turn out a genius as a grown-up.
Both of my parents insisted _______ a computer for me, but I don’t think it is necessary.
Not only should you get used ______ under difficult conditions but you also you pay more attention ______ your work well.
Once your business becomes international, _____ constantly will be part of your life.
Remind me _______ the medicine tomorrow.
The silence of the library was sometimes broken by an occasional cough or by the sound of pages _______.