He had so a difficult exercise that he couldn’t do it .

You aren't doing your homework,  _    ?

None two butterflies have exactly the same design on their wings.

The pleura that cover the exterior of the lungs and the inner walls of the chest cavity is a thin elastic membrane.

Have you learnt the reason why does the water of the ocean becomes blue?

Nobel Prizes are awarded to people who excellent in their fields above and beyond what is expected from scholars.

It is the large city in Europe with a population of over eight million.

In the whole I agree with what you’re saving, but I’m not sure about your last point.

Choose the correct answer to complete the sentence. "Humans now have to suffer the effects of global warming ______ having treated the environment irresponsibly"

Choose the correct answer to complete the sentence. "Having seen people suffer global warming consequences, people decided________ carbon footprints."

Long prized for its medicine value, ginseng these days has become the most common of energy-boosting drinks particularly for high- performance athletes.

Deciduous trees are ones that lose its leaves in the autumn and grow new ones in the spring.

No matter what different, various music types have one thing in common: touching the hearts of the listeners.

The Aardvark is a mammal that burrows into the ground to catches ants and termites

Bronze, after being heated by a strong flame, will change color, especially when exposure  to hydrogen .

There is the very real possibility that these animals could panic, frighten and would break away, should there be a sudden loud noise

It is becoming extremely difficult to grow enough to feed the world’s rapidly increased population.

The skin receives nearly the third of the blood pumped out by the heart.

You don't know her, _    ?

The intent of the Historical Society is to restore old buildings and the increase of interest in the history of the area.

Choose the correct answer to complete the sentence. "We need to cut down on the ________ of carbon dioxide into the atmosphere."