It is good manners to eat up_______is left in your plate.
28.He spent much of the evening with Robert Green,____he had hardly seen in the thirty years since they had worked together at CBS.
27.At last, the boys found themselves in a pleasant park with trees providing shade and____down to eat their picnic lunch.
26.The researehers delermine what type of plants the virus can infect(感染) and____insects can carry the virus.
25.—Did you get my letter? —I received one just as I____.
24.When she called at his studio, she____that he had gone to Japan.