21.   Her main concern was grammar, diagramming sentences, that sort of thing.

22.   Her major concern is how she will succeed at making sure the people on the teams get along with one another.

23.   Her one concern was to reach the upper chamber without being seen.

24.   Her two immediate concerns were to find a home and a job.

25.   His chief concern is the plight of kids growing up in the ghettoes.

26.   His main concern is his message.

27.   His main concern is to be able to provide for his family.

28.   His main concern was that prices were even lower.

29.   However, there was grave concern about the future of the avionic department there.

30.   In the meantime, there is serious concern about the future of secondments for courses longer than one term.