1.I predict he will be an engineer （ ）ten years because he i

1.I predict he will be an engineer （ ）ten years because he is so interested in making things.为什么括号里只能填in,after不行呢?
2.I was bad at english last term ,I will try my best to learn it （ ）,要填from now on,不是from then on?
3.I really don’t know （ ),要填what to do,whaat should I do为什么不可以?
4.but before he moved more than a few steps ,he （ ）,ran back to the old woman,要填turned around ,got back不行呢?
.感激不尽!