instruction:
In this task, you will be given a passage to read. A fill in the blank question will be given to you.  Your answer should fit the blank appropriately.
question:
  The planning system is critical to the viability and operation of GA aerodromes . With many cities lacking scheduled air transport services between them , and with GA access to commercial airports becoming increasingly difficult and expensive , a viable network of aerodromes supporting GA air transport operations is regarded as an important national issue . However , there is no unified national planning policy specific to GA aerodromes , and planning decisions relating to these are based on local issues that are not required to consider the national impact . Because aircraft are excluded from noise control legislation , the only recourse for people affected by aircraft noise is through the planning process , and this issue is the principal factor on which the majority of planning decisions relating to GA land use are made . GA is a specialist subject often unfamiliar to Local Planning Authorities , and most planning decisions relating to GA either refuse permission , or grant it with restrictive conditions . Little Gransden is just one example of a GA airfield required to comply with planning restrictions on the number of movements permitted , thereby inhibiting further development . Such restrictions , if poorly conceived , can make GA operations unviable or even unsafe . fill in the blank  : The planning system is __________________ to the viability and operation of GA aerodromes . 
answer:
 critical 


question:
Private flying can be for both recreational purposes and personal transport , using aircraft that are owned individually , collectively as part of a syndicate , or rented from a flying club . A survey of pilots conducted between 2001 and 2002 indicated that the most common purposes of recreational flights were local flights near the base aerodrome , visits to other aerodromes , and day trips away . Half of all flights landed at the same aerodrome they departed from , and only 9 per cent involved an overnight stay away from home .Private flying is most associated with the traditional form of factory @-@ produced two and four @-@ seater , single piston @-@ engine training and touring aircraft . Examples of these are the Cessna 152 , Cessna 172 , and Piper PA28 Cherokee , all with their origins in the 1950s , and the more modern designs of Cirrus . The average cost per hour to fly such aircraft has been estimated to be £ 133 , compared to an estimated £ 77 per hour for gliders , and a reported £ 35 per hour for microlights . Recent trends have seen an increase in the use of microlights , and also in recreational helicopter flying following the introduction of smaller and cheaper machines such as the Robinson R22 and R44 . Another growth area in private flying in recent years has been in the use of amateur built aircraft , such as the Van 's Aircraft RV @-@ 4 and the Europa .There is a strong vintage aircraft movement in the UK , with two @-@ thirds of the 500 registered historic aircraft active . These cover the whole spectrum of civil and military aviation , examples being the de Havilland Dragon Rapide airliner of the 1930s , and the World War II ( WWII ) Spitfire fighter . There are many post @-@ WWII aircraft which could also be considered historic under a looser definition , including for example 60 ex @-@ military jets such as the Hawker Hunter . Historic aircraft are regular exhibits at air displays , which are claimed to be the second most popular spectator activity after football in the UK.fill in the blank  : Private flying can be for both recreational __________________ and personal transport , using aircraft that are owned individually , collectively as part of a syndicate , or rented from a flying club . 
answer:
 purposes 


question:
 To the south @-@ east of the Great Cave is the second excavation , which faces east @-@ northeast . It includes a chapel at the north end . The front of this cave is completely destroyed ; only fragments of some semi @-@ columns remain . The interior has suffered water damage . The portico is 26 m ( 85 ft ) long and 11 m ( 36 ft ) deep . The chapel is supported by eight eight @-@ cornered columns and two demi @-@ columns and is irregular in shape . At the back of the portico are three chambers ; the central one has an altar and a water channel ( pranalika ) , though the Linga is lost . The shrine door has some traces of sculpture ( a boy , a fat figure , alligators on the frieze , and broken animal figures at the head of a doorjamb ) . The door @-@ keepers of the shrine are now in fragments . A little to the south of the last cave is another cave in worse condition , with water damage . It is a portico in which each end probably had a chapel or room with pillars in front . Two of them have cells at the back . The central door at the back of the portico leads to a damaged shrine . The shrine door has door @-@ keepers at each side , leaning on dwarfs with flying figures over the head , with door @-@ keepers and demons on the jamb and architrave . The shrine is a plain room 6 m ( 20 ft ) deep by 5 @.@ 7 m ( 19 ft ) wide with a low altar , holding a Linga . South of this cave is a cavern that may be used as a cistern . Above these caves is a tiger sculpture , which was worshipped as the tiger goddess Vaghesheri . This sculpture may be a guardian of the north entrance of Cave 1 . A Linga is also found near a small pond at top of the hill . Sculptures depicting a stone with a sun and a moon and a mother suckling a child ( now moved ) were also found nearby . Across the top of the ravine from Cave 1 is large hall known as Sitabai 's Temple ( cave ) . The portico has four pillars and two pilasters . The hall has 3 chambers at the back , the central one a shrine and the rest for priests ( both are plain rooms ) . The door of the central shrine has pilasters and a frieze , with the threshold having lion figures at the end . The shrine has an altar , a water channel , and hole in the centre , in which a statue of Parvati may have been worshipped . A 17th @-@ century record states that  this cave [ has ] a beautiful gate with a porch of exquisitely wrought marble  and two idols , one of goddess Vetal Candi and a head being in a large square seat . Passing along the face of the eastern hill to the north of Sitabai 's cave is a small Hindu excavation with a veranda , which was probably to be three cells , but was abandoned following the discovery of a flaw in the rock . Towards the east of hill is a dry pond , with large artificial boulders and Buddhist cisterns along its banks . At the end of the north spur of the main hill is a mound that resembles a Buddhist stupa . fill in the blank  :  To the south @-@ east of the Great Cave is the __________________ excavation , which faces east @-@ northeast . 
answer:

 second