51.   With advances in refining, neither MTBE nor ethanol is still needed to maintain air quality, the oil industry contends.

52.   With the recession, the owners and operators, Singapore-based Beaufort Hotels Ltd, decided to maintain the quality and focus on improving the services.

53.   Digital videodiscs will offer much higher picture and sound quality than tapes and the quality will be maintained even after they are played many times.

54.   Video discs will offer much higher picture and sound quality than tapes, and the quality can be maintained even after the discs are played many times.

55.   Video discs will offer much higher picture and sound quality than tapes, and the quality will be maintained even after the discs are played many times.

56.   Video discs will offer much higher picture and sound quality than tapes, and the quality can be maintained even after repeated playing of the discs.