Choose the option that correctly completes the sentences be...

Choose the option that correctly completes the sentences below, respectively:

I - The journey was quite quick _______ the road was clear.
II - The meeting has been canceled _______ the strike.
III - I drove at a steady 50 mph ________ save fuel.
IV- There's no reason _______ we shouldn't be friends.
V- _______ all her qualifications, she's useless at the job.