16) the girls should go to the main ofice. their name begin with the letters A-K
=> The girls whose name begin with the letters A-K should go to the main office.
17) the countries will not be helped. they have very large debts
=> the countries which have very large debts will not be helped.
18) the people will be compensated. their house were damaged by the bomb
=> the people whose house were damaged by the bomb will be compensated.
19) the shop will make a big profit. It's turnover is the largest
=> the shop will make a big profit which is turnover is the largest.