have picnics （同义词组）2、make snowme（同义词组）3、wear（近义词组）4、be careful（同义词组）

have picnics 去野营
go on a picnic
have a picnic
make snowmen堆雪人
bulid snowmen
建议用make，这个词更常用
wear穿（状态）
put on动作
be careful小心
take care
look out
如果是be careful of小心。。。
take care of
look out for
祝你学习进步！

很高兴能够在这里回答你的问题,
1 have picnics （同义词组）
go on a picnic
have a picnic
2、make snowmen（同义词组）
make a snowman
build snowmen
3、wear（近义词组）
put on
4、be careful（同义词组）
take care of