—Growing population resulted in growing rubbish.—There is ______that rubbish will become the major threat to human beings in future.

When the post fell _______, Dennis Bass was appointed to fill it.

Your sentence is ________ if you haven’t left out “an”. Next time pay more attention.

After two years’ research, we now have a _______ better understanding of the disease.

------Is it Jim who is driving the new car? -------Probably. I know he has recently bought a ______car.