Nobody know when the process of glass-making was invented.

• (A) know

• (B) process

• (C) was

• (D) invented

Sugars like glucose is made up of carbon, hydrogen, and oxygen atoms.

• (A) like

• (B) is

• (C) made

• (D) up of

Part of the electricity used in the United States today come from hydroelectric sources.

• (A) used

• (B) today

• (C) come

• (D) sources

The languages of the world presents a vast array of structural similarities differences.

• (A) presents

• (B) array

• (C) similarities

• (D) differences

The rise of multinationals have resulted in a great deal of legal ambiguity because multinationals can operate in so many jurisdictions.

• (A) have

• (B) resulted

• (C) can

• (D) operate

All of the east-west interstate highways in the United States has even numbers, while north-south interstate highways are odd-numbered

• (A) has

• (B) numbers

• (C) are

• (D) odd-numbered

When a massive star in the large Magellanic Cloud exploded in 1987, a wave of neutrinos were detected on Earth.

• (A) When

• (B) exploded

• (C) were

• (D) detected

Some of the agricultural practices used today is responsible for fostering desertification.

• (A) practices

• (B) used

• (C) is

• (D) fostering

Every open space in the targeted area that has grass and a few bushes are occupied by the white-crowned sparrow.

• (A) targeted

• (B) has

• (C) are

• (D) occupied

Krakatoa is remembered as the volcano that put so much ash into the air that sunsets around the world was affected for two years afterward.

• (A) is remembered

• (B) put

• (C) was affected

• (D) afterward