This is a story about a strange discovery made in the great Sahara Desert. In 1933 a French officer__________________ in the Sahara through a deep canyon in a mountain range where no other European had ever been.

RIDE

Suddenly he saw that the walls of the canyon__________________ with age-old carvings and paintings of strange unknown animals.

 COVER

News of the discovery soon __________________ many experts of all kinds to the place.

BRING

Dinosaurs lived on our planet millions of years ago. Some of them were very big. Now only their giant bones and footprints __________________.

FIND

Millions of years ago, the world did not look like it does today. Many of the animals that walked the land had bodies low to the ground and legs on the sides of their bodies. As time passed, the land changed. The animals changed too. Some of the animals now had legs under their bodies. They moved __________________ than the other animals.

Marie Curie’s discovery of two naturally radioactive elements, polonium and radium, made headline news. However, her real discovery was that atoms ___NOT/BE___ small solid balls .

There must be even ___SMALL___ particles inside them. This discovery opened the door to all atomic and subatomic research and even to the splitting of the atom.

Curie carried out her research with radioactive elements before the dangers of radioactivity ___UNDERSTAND___. She suffered from radiation sickness for most of her adult life. Indeed, for many years after her death, her notebooks were still highly radioactive.

Do you know Russian rivers? Do you know what the ___LONG___ river in Russia is? It is the Volga River. This river is a great source of hydroelectric power. 

The water from the river ___USE___ for irrigation. Canals link the Volga River to the Baltic and White Seas. 

The Volga ___FREEZE___ for most of its length for three months each year.

Once Mozart was approached by a young man, who was interested in Mozart’s advice on how to compose a symphony. Since he was still very young, Mozart recommended that he should start by ___WRITE___ ballads.

___SURPRISE___, the young man responded, “But you wrote symphonies when you were only ten years old.”

“But I ___NOT/HAVE___ ,” countered Mozart.