— Look! Black clouds are gathering.— Yes. A heavy rain is ______  to come.

I can’t believe that there are _____ many poor people in ____ a rich country.

The famous professor’s lectures, though ____ informal, are considered far more informative and interesting.

Last night Mr. Crook didn’t come back at the usual time. __________ , he met some friends and stayed out until midnight. 

The boys marked ____ a football court on the playground.