Gunpowder, in some ways the most effective of all the explosive materials, were mixture of potassium nitrate, charcoal, sulfuric.

Some jellyfish make daily journeys from deep water to the surface and back, while others migrate horizontally.

Running long the 180 meridian, the International Date Line is separated day from another 

Allen’s not having finished his thesis did not discourag from applying for other degree program.

The Egyptians first discovered that drying fruit preserved it, made sweeter and improvement its flavor.

Of all outdoor activities, Paul likes fishing best of all, but he doesn’t enjoy cleaning fishing rods afterwards.

The word(s) CLOSEST in meaning to the following word(s). " interference"

Bill was about average in performance in comparison with other students his class

Drying food by means f solar energy is a ancient process applied wherever food and clima conditions make it possible.

What we know about certain diseases are still not sufficient to prevent them from spreading easy among the population

Carol is wearing a new dress and Helen loves it.
- Helen: “_______”
- Carol: “Thanks. I’m glad you like it. My sister give it to me yesterday.”

In some species of fish, such the three-spined stickleback, the malen, not the female, performs task of caring for young.

Even the smallest pulley can be done stronger by adding wheels to system to create more leverage 

“How do you like your steak done?” _ “_______.” 

He knows to repair the carburetor without taking e whole car apart.

Her application for a visa was turned down not only because it was incomplete and incorrectly filledt but also because it was written in pencil 

I have a favor to ask you. –"...................................." 

When I came back , I realized that the camera had been disappeared

Since fireworks are dangerous, many countries have laws preventing busin to sell them.

When radio programs became popular, approximately around 1925, people stopped attending movies.

Unexploded bombs buried deep in the ground have been found the construction site opposite of the City Hall.