I regret ___ harder in the past two years.
People are _________the use of alternative energy sources. Because the fossil fuels _________will be used sooner or later.
Now young people ___________to use computer to develop their ___________skills.
The future of developing countries__________ the hands of children, which is __________education and training for young people is important.
____________ poverty, wars _____________ thousands of lives in Africa so far.
Being aware of the__________of the disaster, some famous stars organized a charity concert to raise money for the victims.