31.   Any industrial byproducts or waste can be used for this purpose.

32.   Approaching the signal box he mounted the steps, the hand-rail creaking as he used it for support.

33.   Archaeological evidence will provide clues about what the building was used for.

34.   As a householder you should pay particular attention to outdoor threaded bib-taps which are usually used for garden hoses and sprinklers.

35.   Ask the students if they know what baking powder and baking soda are used for.

36.   At an early date, the inland brine springs of Droitwich and Cheshire were discovered and used for the manufacture of salt.

37.   Body suits are already used for virtual-reality-based applications, using sensors all over the body to detect movements.

38.   Both are used for winter fodder.