用所给词的正确形式填空。每词限用一次。

improve,   build,   bring out,   nod,   greet

【小题1】The environment in our city ________ greatly through our work in the near future.
【小题2】Charlie ________ the best in his competitor. It’s great to play against him.
【小题3】The scientists ________ each other when I saw them.
【小题4】In our city we ________ the subway line through the sea.
【小题5】I asked where the dog was and Steve ________ in the direction of the kitchen.