Bomber was rare and worth rescuing.为什么要用rescuing 为什么不用 to rescue 为什么不用 rescued

Bomber was rare and worth rescuing.为什么要用rescuing 为什么不用 to rescue 为什么不用 rescued in quite reasonable condition什么意思具体点a Lancaster bomber in reasonable condition was rare and worth rescuing这里的reasonable By 1898,a bomber was rare and worth______.A.to be saved B.to save C.saved D.savingB为什么不对? a Lancaster bomber in reasonable condition was rare.这里为什么加in by this time 是什么意思在by this time,a Lancaster bomber in reasonable condition was rare and worth rescuing.中,by this time是什么意思?by this time 还有什么意思吗?over the years是什么意思? By this time,a Lancaster bomber in reasonable coindition was rare and worth rescuing最后rescue为什么是ing 形式,如果说是be worth doing,那么be动词在哪里,只有一个worth doing啊,这到底是怎么理解 在新概念英语第66课当中有这么两句：By this time ,a Lancaster bomber in reasonable condition was rare and worth rescuing.这句如何翻译?还有一句：A long way west of Samoa.这句又如何翻译? Wallis Island is west of Samoa.Wallis is ____.a.to the west of Samoa b.to the east of Samoa c.in the west of Samoa d.in the east of SamoaBy 1989,a Lancaster bomber was rare and worth _____.a.to be saved b.to save c.saved d.saving______the years that a Lancaster bomber in reasonable condition is rare里面in怎么理解?表示状态吗? In the past,celiac disease was considered rare and limited mostly to people of European ancestry.rare and limited 在这句中做什么成分? contains rare beauty and enchantment 英语翻译Bomber at C.I.A.Base Had Ties to Jordan Spy AgencyISLAMABAD,Pakistan — The suicide bomber who killed seven C.I.A.officers and one Jordanian intelligence officer last week in southeastern Afghanistan was an asset of the Jordanian intelli RARE rare 英语翻译这是一篇英语论文中的,希望能人帮下忙!急用.需要翻译的英文为：Compound 9 was rare in the nature,it was reported in the Rosaceae sanguisorba,scammony dodder and saururaceae heartleaf,and was a characteristic chemic 翻译I thought this was unusual because it is rare for grandparents to live with their children and grandchildren in the USA he authorities declared that because of the war petrol was _____ and had to be rationed (定量供应).A.inadequate B.rare C.lacked D.scarce KANSAS CITY BOMBER怎么样