读句子，根据汉语或首字母提示补全单词。

1. "Would you come here?" he asked very __________(有礼貌地).

2. Susan was so careless that she made many m__________ in the test.

3. When he saw her, he said that he needed an __________ (手术)at once.

4. The apartment is so expensive that Mr. Green can't a__________ it.

5. The camera was one of the great __________ (发明) in the second half of the 19th century.