4 B
don't +动词原形，排除A与D ，C应该是 go across
5 B
It's +形容词+for sb + to do sth 固定用法‘ 对某人来说做……是……’
What , think of
不明白可追问；如果对你有帮助，别忘了采纳和点赞哦！Thanks!
May you be happy everyday and make great progress !
4 B
don't +动词原形，排除A与D ，C应该是 go across
5 B
It's +形容词+for sb + to do sth 固定用法‘ 对某人来说做……是……’
What , think of
不明白可追问；如果对你有帮助，别忘了采纳和点赞哦！Thanks!
May you be happy everyday and make great progress !