用括号内所给单词的适当形式填空。
1. —How about going ____ (camp) this weekend? —That's a good idea!
2. When you go to a new place, you should remember the ____ (direct).
3. We ____ (notice) the bad man run out of sight quickly just now.
4. Tom is looking forward to ____ (receive) his father's letter, because his father works far away.
5. The old man's job is to look after ____ (camel) and he is satisfied with it.