the young fellow is a kindhearted man and always thinks of _

the young fellow is a kindhearted man and always thinks of __he can do more for his neighbor填什么
第一题the young fellow is a kindhearted man and always thinks of __he can do more for his neighbors
答案选how,说从句不缺成分；但我觉得do缺了宾语所以选what.
第二题to expand economy,the mayor has made ambitious plan to turn his city into a place___young people would choose to inhabit rather than leave.
答案填that,认为从句缺宾语,但我认为choose作不及物动词,从句就不缺成分,可以用where.