We are planning to go to the science museum this weekend.

He is my schoolmate.

He is an expert in pomology and is researching the cultivation methods of many fruits.

Chemical pollution has a serious impact on the health of the Earth.

He negotiated with his boss for a raise in salary.

He is hoping that his salary will be increased.

He is asking for a reduction in taxes.

He is thinking of tax-saving measures to reduce his taxes.

The school rules of this school are strict.

Photochemistry is a branch of chemistry that studies chemical reactions affected by light.