完成句子1活动前和活动中的互相支持和帮助是非常必要的.it's necessary for you___________

1活动前和活动中的互相支持和帮助是非常必要的.
it's necessary for you_to help and support each other _before and during the event.
2这将会是你终生难忘的一次经历.
this well be a unforgettable experience of your whole life
3这个慈善行走在每年12月份举行.
this charity _walk_is held__in december every year.

1.to support and help each other
2.an experience you will never forget
3.charity holds in