2.  humans in malarial regions have been evolving dozens of chemical defenses against malaria

3.  there has been, in malarial regions, an evolution of dozens of human chemical defenses against malaria

4.  dozens of chemical defenses against malaria have been evolved by humans in malarial regions

5.  similarly, in malarial regions, humans have evolved dozens of chemical defenses against malaria

1.  As virtually all the nation's 50 busiest airports are

2.  As with virtually all of the nation's 50 busiest airports

4.  Like the cities where virtually all the nation's 50 busiest airports are

5.  Like other cities where virtually all the nation's 50 busiest airports are

1.  act as a buffer, so that it absorbs

2.  act like a buffer so as to absorb

4.    acting as a buffer, absorbing

5.  acting like a buffer, absorb

1.  steel's replacement to materials like

3.  the replacing of steel with materials of

4.  the replacing of steel by means of materials like

5.  to replace steel by materials such as

1.  Senior executives had a larger percentage increase in pay in 1990 than

2.  The percentage of senior executives' pay increase in 1990 was larger than for

3.  The 1990 increase in pay for senior executives was larger in terms of percentage than

4.  In 1990 senior executives had a larger pay increase in terms of percentage than did

1.  new federal rules calling for major modifications to older planes

2.  new federal rules, which call for major modifications to older planes

4.  major modifications to older planes called for by new federal rules

5.  major modifications to older planes are called for according to new federal rules

2.  over if Ali, the Prophet Muhammad's son-in-law, was going to carry on and be the fourth caliph, Muhammad's successor

3.  over whether Ali, the Prophet Muhammad's son-in-law, was going to carry on and be the fourth caliph, Muhammad's successor

4.  as to whether the fourth caliph, Muhammad's successor, is to be the Prophet Muhammad's son-in-low, Ali

5.  concerning if the fourth caliph, Muhammad's successor, was to be the Prophet Muhammad's son-in-law, Ali

1.  found that they could raise prices according to this amount without thereby provoking

2.  found that they were capable of raising prices by this amount and not provoke

3.  find that they are capable of raising prices by this amount and not provoke

5.  are finding that they can raise prices according to this amount and will not thereby provoke

1.  one of the first of Britain's national museums seeking support from

2.  one of Britain's first national museums seeking support of

3.  among Britain's first national museums to seek support of

5.  among Britain's first national museums that have sought the support of

1.  fund, with the intention to sustain the state's economy after the exhaustion of its oil reserves

2.  fund, the intention of which is to sustain the state's economy after they have exhausted their oil reserves

4.  fund intended to sustain the state's economy after exhausting its oil reserves

5.  fund that they intend to sustain the state's economy after oil reserves are exhausted