____ the old mother’s deeds, all of us couldn’t keep back our tears and began to cry.
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 coughorby the sound of pages _______.