I have trouble completing sentences for selecting the right word for the sentence.
I have trouble completing sentences for selecting the right word for the sentence.
The answer to question 10 is (a) and why is it not b?
The answer to this 11 is (a) because it is past sinple?
The position of 13 is b, I did not understand why it is not (a) then the sentence is positive.

I would be happy if you could give me words that directed you to the right answer.
And tips for a solution
thanks and have a good day
American rapid-prototyping experts (10. abelieve – bare believing - chave believed) it is only a matter of time before such machines (11. abecome - bhave become - cwould become) common and nurses will be using them as routinely as they currently use x-rays. Moreover, in (13. afew - ba few - cfewer) years these ingenious machines will be able to produce replacement body parts such as teeth, bones and even entire organs.

Question

I have trouble completing sentences for selecting the right word for the sentence.
I have trouble completing sentences for selecting the right word for the sentence.
The answer to question 10 is (a) and why is it not b?
The answer to this 11 is (a) because it is past sinple?
The position of 13 is b, I did not understand why it is not (a) then the sentence is positive.

I would be happy if you could give me words that directed you to the right answer.
And tips for a solution
thanks and have a good day
American rapid-prototyping experts (10. abelieve – bare believing - chave believed) it is only a matter of time before such machines (11. abecome - bhave become - cwould become) common and nurses will be using them as routinely as they currently use x-rays. Moreover, in (13. afew - ba few - cfewer) years these ingenious machines will be able to produce replacement body parts such as teeth, bones and even entire organs.

Answer

For 10, the phrase "are believing" is present continuous tense, but when we describe what someone believes we use simple present tense. There are two reasons I can see for this. The phrase "are believing" implies their belief is not very firm and can change. Another reason is that when we use the phrase "are believing" we often mean "are currently believing", and again, this implies something other than a strong belief.

For 11, yes, "have become" is past tense.

For 13, we always use "a" with the phrase "few years".

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