And in that way it has been proved that the ...

[ Grammar ]

And in that way it has been proved that the radioactive elements are constantly ______ and that they produce at the end ordinary elements, principally helium and lead.

A. disintegrating

B. to disintegrate

C. being disintegrating

D. disintegrated

Select your answer:
A B C D E

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You ___ touch the paintings in the museum. It’s not allowed.

A. can

B. can’t

C. could

D. couldn’t

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______ I didn’t understand the explanation, I registered to additional grammar classes.

A. Because

B. As soon as

C. After

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________ are the laptops going to be kept?

A. We’re
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Choose the sentence with the correct placement of commas.

A. How do I turn on this computer, Mr. Thomas?

B. How do I, turn on this computer Mr. Thomas?

C. How do I turn on this computer Mr. Thomas?