Choose the correct verb form:

Before Gagarin’s _____ flight, there were still enormous uncertainties.

Genetic engineering is helping researchers unravel the mysteries of previously incurable diseases so that they can get to its root causes and find cures

After working hard for so long, we decided to enjoy ourself to  nice long holiday

Until Hollywood invented him, Leonardo DiCaprio was practically unknown

Do you ever feel that life is not being fair to you because you cannot seem to get the job where you want that really suits you?

Choose the best option:

She’s the woman ................ sister looks after the baby for us.

He’s so brilliant and he can do anything - ……….

Hailey’s comet was named after the astronomer Edmund Hailey, who was the first realize that some comets appear in regular cycle.

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

Don’t tell me I’m addicted smoke if I only have three cigarettes a day!

New York City surpassed the order Atlantic seaports in partly because it developed best transportation links with interior of the country.

 Water molecule consists of two hydrogen atoms and has 1 oxygen atom.

The plans the building complex were describing by the architect

Materials that of clay are among the ancient articles and have played a vital role in human civilization.

The police have been _____ in to deal with the riot. 

We could make better ______ of our energy resources.

Archeological studies have provided evidence that the use of plants for decoration as well as for food developed early the history.

Do you think that  the humans will ever be able to live in other planets?

Identify the error in each sentence: The man who name’s Hung gave you this letter

Because of their color and shape, seahorses blend so well with seaweed in which they live that is almost impossible to see themselves

Students in the United States often support themselves by babysitting, working restaurants, or they drive cabs.