Read the following passage and choose the best answer to each question. Write your answers in the space provided. 

For centuries, skywatchers have reported seeing mysterious flashes of light on the surface of the Moon. Modern astronomers have observed the same phenomenon, but no one has been able to satisfactorily explain how or why the sporadically sparks. However, researchers now believe they have found the cause.

Researchers have explained the chemical content of Moon rocks retrieved by astronauts during the Apollo missions and have found that they contain volatile gases such as helium, hydrogen, and argon. The researchers suggest that stray electrons, freed when the rock cracks, may ignite these gases. Indeed, lunar rock samples, when fractured in the lab, throw off sparks.

What causes these rocks to crack to the lunar surface? The flashes are most often seen at the borders between sunlight and on the Moon, where the surface is being either intensively heated or cooled. A sudden temperature change may cause thermal cracking. Another possibility is that meteors may strike the rocks and cause them to crack. Finally, lunar rocks may be fractured by seismic events- in other words, by tiny moonquakes.

Which of the following can be inferred from the text?

Choose the best answer. "My brother enjoys to going to the park ______Summer evenings."

Choose the correct answer to complete each of the following sentences. 

It was ___________that even Smith’s fans couldn’t believe it.

Choose the word or phrase which best completes each sentence.

Mary Smith decided to give up her job for the _______ of her children.

Choose the word or phrase which best completes each sentence.

“Listen Donna, I don’t care if you __________ the bus this morning. You ________ late to work many times. You are fired!” the boss said.

Choose the best answer from A, B, C, or D to fill in the blanks.

George: “_____________.”

Michelle: “Thank you for your compliment.”

Choose the best answer to complete these following sentences

We think that with our solidarity we can______this difficulty.

Choose the correct option: Nam usually goes to school ....... 7:00 in the morning.

Choose the best answer to complete each of the following sentences. 

Regina, ______________ you have never met before, is a genius in painting.

 Choose A, B, C, or D to complete the sentence.

When the tracks leave the place, the ground is coped _____ trash and a few minutes later there is a smell and flies.

I don't like watching sports because some of them are ............

Choose the word or phrase which best completes each sentence. 

We named our first daughter __________ our favorite singer.

Choose the word or phrase which best completes each sentence.

The _________ source of power in 1970 was from natural gas, with almost 25%.

 Choose A, B, C, or D to complete the sentence.

Thank you for your valuable _____ to our seminar last weekend.

Choose the correct answer to complete each of the following sentences. 

I saw him hiding something in a ___________ bag.

Choose the correct answer to complete each of the following sentences. 

In this town, they ______ all the frames in steel.

Choose the correct answer to complete each of the following sentences. 

What time will you _______ for Da Lat?

 Choose A, B, C, or D to complete the sentence.

Jack, as well as his two sisters, hardly ever went out in the evening, _____?

 Choose A, B, C, or D to complete the sentence.

Are there enough apples for us to have one _______ ?

Choose the best answer to complete these following sentences

We have many well__________teachers here.

Choose the correct answer to complete each of the following sentences. 

 I was the first person ___________ the accident.