I don’t doubt _____ he is a brilliant scientist, but can he teach?
_____ people are generally better off, the gap between the rich and the poor has widened.
In most countries, urban population is ____ while the population of German ___ by 8 percent.
I finally had to _____ the subject of payment.
There is something wrong with my washing machine and it requires _____.
We walked a long way to see him off, only _____ that he had just left.