The young man made a _________ to his parents that he would try to earn his own living after graduation.
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 _________.
Unfortunately, ____ stone hit him on ______ head and he got injured.
—I’m sorry I broke your teapot. —.