Life is a winding road (metaphors)

I can't work with such arrogant people, he is real pain in the (a)   for me!

She is so outgoing and always willing to break the (a)   with a smile.

Government-sponsored education has been created to help the most talented to have a possibility to study, it's like a (a)   to a new world.

I believe we are on the right _____ with this solution.

• road

• race

• track

• way

It's important for me to get to my _____ and remember where I came from.

• track

• roots

• ancestors

Human nature always wants to break (a)   of any boundaries.

Don't perceive everything so ________ , think wider, consider a bigger picture.

• littered

• explicitly

• literally

At the _____ of project, 3500 workers were employed.

• light

• wave

• peak

In other words, it's a complete (a)   that leads to all sorts of complicated issues. (MEANING: go through a difficult time)