Mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase: 
During the last 400 years, most scientists have ________on mathematics in their development of their inventions or discoveries.

_______ the sun rose, the fog dispersed.

Many people have stopped to smoke because they are afraid that it may be harmful to their health.

Salmon lay their eggs and die in fresh water, although they live in salt water when most of their adult lives.

A mainframe computer is large and is usually used to operate a network of another computers.

The first postage stamp, issued on May 6th 1860 in England, is was the Penny Black, which featured a profile of Queen Victoria.

___ hard he worked, he could earn enough money to support the family.

About 150 years ago, Charles Darwin shocked the world with his the cry that humans were relativity to apes

More than 10,000 years ago, glaciers moved across the Minnesota region four time, leveling most of the land.

It’s not worth to spend money on things like cheap clothes.

Galaxies are composed of millions of individual stars_______ are so far away that they appear as single pints of light.

Our house has been redecorated last week. You can still smell paint when you enter and the wallpaper has a striking contrast with the floor.

Staying in a hotel costs ______ renting a room in a dormitory for a week.

We're going to buy a special ticket_______ we can go anywhere we like on the way.

Early radio was called the “wireless” because radio uses invisibly waves to carry information.

Mrs Stevens, along with her cousins from New Mexico, are planning to attend the festivities.

The living room was enough large to accommodate two long sofas easily

Monkeys use their foot to eat food, to gesture, and to climb.

The invention of the Silicon chip in the 1960s has revolutionized the computer industry

I went to buy a Rolling Stones CD ________ the shop didn't have it.

It was him who came running into the classroom with the news