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I have some questions if you don't mind...

1) ..............., he decided not to swim.

a) The lake is very hot

b) the pond being so cold

c) he has been feeling very ill.

d) since the weather is quite good

e) As he doesn't like going out.

The answer key shows "b" is correct.But I don't understand why. that sentence seems wrong to me.( c can be acceptable to me)

2) If you had taken my advice those days, ................ now.

a) you wouldn't be living in the streets.

b) you could be rich.

I know "a" is correct but not "b"?

3) The fact that space exploration has increased since the 1960s ......................................................

a) is a representative of our small desire to learn more about our solar system.

b) indicates that we are very enthusiastic to learn about our solar system.

The answer is "a" but I think "b" is correct.

4) ..........everyone developing many different skills, specialization came obout as a result of agriculture and this gave rise

to the beginning of technology.

a) Notwithstanding b) Even though c) Nevertheless d) Although e) Instead of

Which one is correct I couldn't find.

Thanks.
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1-- C needs a conjunction. B is a little awkward, but grammatically correct.

2-- No; B would have to read you could have been. Conditional III.

3-- A seems wrong because of a representative-- the article should not be there. B is probably wrong because of enthusiastic to learn, which does not seem native-- though I can't tell you why at this late hour.

4-- Only instead of will take the nonfinite participle developing.
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Thank you Mister Micawber