I can’t play the piano, and ___

Turn down the TV， dear. Our son ________ for his report in the study.

There came a point in his life ______ hehad to think seriously about his future．

To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of _______ energy.

The first thing ________ I did was to seeif there were any products ________ might help me, but there only seemed to bepowders ________ to kill snakes.