有若干英语问题,请帮忙,谢谢1. I don't want the children ___ out in such w

有若干英语问题,请帮忙,谢谢
1. I don't want the children ___ out in such weather.A take B to take C taken D taking
2.We found her greatly ____. improving B changed C to help D having disturbed
3.The reasearch is so designed that once ___ nothing can be done to change it. A begins B hacing begun C beginning D begun
4.He finished his homework and then went on ____help me.
A helping B with help C with helping D to help
5.In order not _____,I soent a whole day ____in my study.
A to disturb;to lock B to be disturbed;locking C to disturb'locking D to be disturbed'locked.
6.______his term had won,his face lit up at once.
是填when knowing,还是knowing?有什么区别吗?
谢谢!请写明讲解,主要是讲解,我感觉这好像都是一类题,麻烦给我讲一下,谢谢!