I feel very angry when hearing that Japanese government tries to _________ Diaoyu Island.

I was not good at math, so my friend helped me _____ it last night. [ ]

We can’t go home _____ the heavy rain and we have to wait _____it stops.[ ]

_______ the smoke come out of the building, my first thought was to call the fire department as soon as possible.

His business failure left him at the edge of desperation, but, , he managed to go out of the shadow through years of efforts.