根据句意及汉语提示,写出各单词的正确形式,每空填一词.

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

2. Some people are good at ________, but they never give back. (借)

3. With the _______ of modern medicine, many difficult illness can be cured and prevented.(发展)

4. Everyone was very generous and they had lots of support from local b________. (企业)

5. They are so weak that they can't walk any ________. (远)

1990年3月21日（）正式宣告成立，至此，非洲大陆殖民化的历史宣告终结。

A.南非共和国

B.西非共和国

C.莫桑比克共和国

D.纳米比亚共和国