根据下列句子及所给汉语注释，写出空缺处各单词的正确形式。（每空只写一词）

1. He doesn't _________ (赞成) of smoking in bed.

2. One of the best _________ (导游) will show you around the palace.

3. She is very _________ (乐观的) about the result of the discussion.

4. He took out the wet clothes and _________ (挤出) the water out.

5. The Group of Eight (G8) _________ (组成) of the eight richest countries in the world.