should be

• Sick people should be careful about their diet .
  病人对饮食要多加检点。
• Problems should be resolved in ( good ) time ...
  有问题要及时加以解决。
• All men should be treated with justice .
  人人都应该受到公正待遇。
• This card should be kept on file for reference .
  此卡应存档备查。
• Obviously, these troops should be disarmed .
  显然应解除这些军队的武装。
• Clothes should be changed and washed regularly .
  衣服要勤洗勤换。
• Stress should be put on the prevention of diseases .
  疾病应以预防为主。
• Her voice should be professionally trained .
  她在运嗓上应接受专业训练。
• It should be possible to go to the front .
  到前线去应当是可能的。
• Pork and mutton should be kept in cold storage .
  猪羊肉应该冷藏。