根据句意，用所给单词的适当形式填空。
1. The experiment he did last week was very _______(success).
2. Our classroom is much brighter than________(they).
3. They received kind________(treat) from him.
4. She wondered if they________(arrive) in Yantai in two days.
5. Mr Wang asked us to pick up the waste paper______(throw) everywhere on the playground.