21.   It is a taboo subject, and the Marriage ceremonies are performed in secret.

22.   It need not, therefore, be related to any act performed in the belief that it has normative consequences.

23.   Marriages performed in one state are routinely recognized by other states.

24.   NASA has used the space shuttle to study how materials perform in a weightless environment.

25.   Nothing about the manner in which he performed suggested the adverse condition of a man under the stress of an impossible enterprise.

26.   Outside London, you can find yourself performing in student unions, arts centres, pubs, theatre foyers or art galleries.

27.   Performed in Shiraz it aroused enormous anger and offence.

28.   Prospective studies have also been performed in subjects with impaired glucose intolerance.

29.   She still gets very nervous about performing in public.

30.   She was torn between her love of dancing and her fear of performing in public.