I have been staying up until midnight since Monday, _____ on my paper. I need to catch up on some sleep this weekend.
Countless people in developing countries no longer suffer malnutrition.______,poverty remains a problem worldwide.
We paid ______ cash in the hope that we can get 15% ______.
Some advertisements,like the environmental protection advertisement ______ to our conscience or our desire to be worthy citizens.
He makes about $1000 every week,much ______ is spent on books.
We were very tired and walked with difficulty,but we got home ______.