用所给单词的适当形式填空。

1. Can you give me your _________ (explain) for your absence?

2. During the Spring holidays there are many __________ (culture) activities.

3. In America, we often greet people by __________ (shake) hands or hugging.

4. I'll call you as soon as I _________ (get to) New York.

5. Could you tell me some special customs that _________ (not find) in Chinese culture?