The English-Chinese dictionary ______ my father bought for me many years ago is still of great value.

My teacher’s rich knowledge of science ______ my decision ______ study science.

I can’t believe that anyone else in the school can swim as fast as you, ________?

Each child is unique and teachers should encourage each one to develop their ________.[ ]

Some researches have proved that water quality ____ due to too many dams and pumps in some areas.