根据对话意思和所给首字母，写出完整正确的单词。

Susan: Where are you going, David?

David: To Beijing?

Susan: It's a long trip from here by bike. How long will it take you to (1)c_________it?

David: About two years.

Susan: How many (2)o                 you are making the trip?

David: Five.

Susan: (3)W_________are you making it?

David: We are trying to collec some money.

Susan: What will the money be used for?

David: To a charity (4)c__________ Protecting the Red-Crowned Crane.

Susan: That sounds great. Good (5) l__________ with your trip.

David: Thanks.