请用方框中单词或短语的正确形式填空,词数不限。每个单词或短语只用一次,其中有两项是多余的。
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21. Our company has a
______ to quality and customer service.
22. In short, a good and
______ environment at home is necessary for a child to grow healthy.
23. An essay not
______ in class on the due date will lose a letter grade for each class period it is late.
24. There is yet a population besides professional and
______ star observers that suffers even more from light pollution.
25. If they win the final tonight, the team is going to tour around the city to be cheered by their
______ supporters,
26. Humans are the only animals that produce tears
______ emotions, and most people say a good cry makes them feel better.
27. The symbol,
______ of human and tree-like shapes, was created using a calligraphic art from.
28. Activities all take place under the
______ of an experienced tutor.
29. About 98 cents of every duck stamp dollar goes directly into the Migratory Bird
______ Fund to purchase wetlands and wildlife habitat.
30. Our heartfelt
______ goes out to the victims of the war.