Structure grammar

[genteel]

In my TOEFL pbt test preparation, and I found these questions:
1)Anyone who has ever pulled weeds from a garden roots _________ firmly anchor plants to the soil.
(A) is well aware of.
(B) is well aware that.
(C) well aware.
(D) well aware that.
Here the answer is (C). Why not (D)?


2) ____ young, chimpanzees are easily trained.
(A) When are.
(B) When.
(C) They are.
(D) When they.
The answer here is (B). Why?


3) In 1775 Daniel Boone opened theWilderness Trail and made ____ the ftrst settlements in Kentucky.
(A) possibly it was.
(B) as possible.
(C) possible.
(D) it possible.
The answer here is (C). why?

4) A major concern among archaeologists today is the preservation of archaeological sites,_____ are threatened by development.
(A) of which many.
(B) many of them.
(C) which many.
(D) many of which.
The answer here is (C). Why?

I hope you answer me because my exam is after tow days.
Thanks in advance.

 

[tzfujimino]

Are you sure about #4?
I think the answer is (D).
(I find #1 very strange.)

 

[GoesStation]

Either you made some mistakes transcribing the test questions or the test prep document you're using contains some errors. Please review questions 1 and 4 in particular.

 

[genteel]

I reviewed all the questions from my book, they are all correct as I've already shown.

 

[MikeNewYork]

Your copying might well have been correct, but the questions are not. The correct answer for 4 is D. There is no correct answer in 1.

 

[GoesStation]

I reviewed all the questions from my book, they are all correct as I've already shown.

Please review question 1 again. I think it should be "1)Anyone who has ever pulled weeds from a garden _________ roots firmly anchor plants to the soil."

If it doesn't say that, the editor made a mistake.

 

[MikeNewYork]

I like your redo. In that, the correct answer is B.