How many students are there in your classroom now— There aren’t ______.

___ unsolved, this may lead to more serious problems

We’re all ready to put it into operation, _____, we’re going to take action as fast as possible[ ]

No one can deny that it is ______ that many more residents could have been injured if the building had fallen at midnight.

The island country had fought _____ the invaders for more than ten years _____it became an independent republic.[ ]