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  c____it?
David: About two years.
Susan: How many o____  you are making the trip?
David: Five.
Susan:  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 c____  Protecting the Red-Crowned Crane.
Susan: That sounds great. Good l____ with your trip.
David: Thanks.