阅读下面短文，根据短文内容填空。在未给提示词的空白处仅填写1个恰当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

We are writing 【小题1】 (call) on everyone to take part in the Clear Your Plate campaign. It urges people to save food by not wasting anything on the dining table. You may not know over 30% of the world’s food 【小题2】 (waste) every year, while many people in poor areas do not have enough to eat. Reducing daily food waste by just 5% could save millions of people from starvation. Let’s start doing 【小题3】 we can to make the world a better place.