Помогите безотлагательно!!!!!!Даю 50 баллов!!!Read these dialogues and write the correct word.

Помогите безотлагательно!!!!!!Даю 50 баллов!!!
Read these dialogues and write the correct word.
Example 0. Shall we go to the
cinema? That's a good_____
Answer 0. idea
1. - How______ buying these apples? - Sorry, I don't think that's a really good idea.
2._______don't we sell these books? -Do you think so?
3.- What about visiting this museum?
-Sorry,I_______think it's a good idea.