We have yet to (i) _______ the assessment of Canada’s biodiversity.Most of the vertebrates have been assessed, but our challenge will be the assessment of invertebrates and plants. This task is (ii) ________ not only because of the high number of species, but also because of the diversity, each species requiring a different approach.

For Blank- 1

Since we are told that most of the vertebrates are assessed, the word for the first blank cannot be initiate. Again since the challenge is to assess the invertebrates and plants, we can eliminate limit - our task is not to limit but to complete all the assessment. So the correct choice is complete.

For Blank- 2

The task is not trivial because of the high number of species, so we reject that as a choice.
The task is not repetitious because of the diversity and each species requiring a different approach.

The choice is daunting.
_________________

Explanation

The sentence implies that Canada’s invertebrates and plants have not yet been assessed, so the assessment of Canada’s biodiversity is not finished; therefore, the correct answer to Blank (i) is “complete.” The assessment of invertebrates and plants is described as a “challenge,” so the answer to Blank (ii) must be synonymous with “difficult.” The only answer choice that matches this meaning is “daunting,” so it is correct. Thus the correct answer is complete (Choice B) and daunting (Choice F).

For the second blank why can't daunting be the answer as a high number of species, each requiring a different approach, cannot be a repetitious task

Sorry,

I have fixed the OA that indeed is daunting as you pointed out.

Notice That in the second reply of this thread AKA the official explanation the answers were right: B and F. In the spoiler the second blank was wrong.

Anyhow, Thank you so much.

Are these questions from the Official guide too easy or similar questions appear on the GRE?

The oG is old five years now

I would expect they are far more difficult