Only by imagining and creating ____ a difference.
His promise ___ he would marry her when he came back turned out to be a lie, ___ left the girl heart-broken.
If we ___________some measures, we might have prevented the environmental pollution.
Many Chinese universities provide scholarships for students _____financial aid.
Scientists are convinced _____the positive effect of laughter _____physical and mental health.
Could you give me a hand? It seems that my strength has _________.