1 . World Consumer Rights Day is celebrated ________________ (annual) by consumer organizations worldwide. （所给词的适当形式填空）

2 . The industry has grown by 30% ________ (annual) over the past 10 years.(所给词的适当形式填空)

3 . The Nobel Prize in literature is awarded ________ (annual) to an author who has produced the most outstanding work in the field of literature. (所给词的适当形式填空)

4 . For the Armstrongs, traveling abroad costs an arm and a leg ________ (annual).   (所给词的适当形式填空)