As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
He felt rather __________ that she should drive the car at such a____________ speed.
The old woman is sitting_____________ her daughter.
--__________?--It depends on what it is.
We can’t go on with the experiment because the computer_________.
The two sides have finally___________, though some small differences still exist.