Parallelism and Comparison

A rural airstrip presents a pilot with two primary difficulties: to land on dirt, and avoiding dangerous crosswinds.

• [NO CHANGE]

• landing on dirt and avoiding

• landing on dirt and the avoidance of

• the landing of the plane on dirt, and avoiding

I prefer my Japanese history class to sitting and listening to American history.

• [NO CHANGE]

• American history

• my American history class

• sitting in American history class

Getting an article published can be quite tedious; once written, it must still be edited and reviewed before it is distributed.

• [NO CHANGE]

• edited and pass review

• review and will be edited

• review and they will edit it

Though wax candles pose a risk of fire hazard, due to their open flames, they generate a light that is more relaxing than electric candles.

• [NO CHANGE]

• electric ones

• an electric candle

• that of electric candles

To put berries in your breakfast cereal is one healthy idea; putting bananas in your oatmeal is another

• [NO CHANGE]

• To put berries in your breakfast cereal is one healthy idea;

• Putting berries in one's breakfast cereal is one healthy idea;

• Putting berries in your breakfast cereal is one healthy idea;

Unlike the flu, people who suffer from the common cold may only have to deal with a headache and a congested nose for twenty-four hours.

• [NO CHANGE]

• having the

• people with the

• when you have the

The website's stated mission was "to preserve the internet, and we will record illegal online censorship."

• [NO CHANGE]

• the preserving of the internet and to record

• to preserve the internet and to record

• to preserve the internet and keeping records of

My friend makes electronic music by sampling classic tunes and combining them into a remix.

• [NO CHANGE]

• music by sampling classic tunes and combines them

• music, samples classic tunes, combines them

• music with samples of classic tunes and combining them

To keep her life private and protecting her family, the pop star wore masks and costumes during her live shows.

• [NO CHANGE]

• To keep her life private, protect

• Keeping her life private and to protect

• To keep her life private and protect

The hands and feet of chimpanzees are far more versatile and dexterous than humans.

• [NO CHANGE]

• humans are

• that of humans

• those of humans