Since we . . . . . . . . read every book, we . . . . . . . . only the famous ones.

have , sold
should , buy
must , ignore
can , purchase E. cannot , select

The correct answer is: C. must, ignore

The sentence is in the passive voice, so we can eliminate options A, B, and D. Option E is also incorrect because it is not grammatically correct to say “we cannot select only the famous ones.”

The only option that makes sense is C. must, ignore. This is because if we have to read every book, then we must ignore the less famous ones in order to have enough time to read all of them.

Here is a more detailed explanation of each option:

  • Option A: have, sold. This is incorrect because the sentence is about reading books, not selling them.
  • Option B: should, buy. This is incorrect because the sentence is about reading books, not buying them.
  • Option C: must, ignore. This is the correct answer because it is the only option that makes sense in the context of the sentence.
  • Option D: can, purchase. This is incorrect because the sentence is about reading books, not purchasing them.
  • Option E: cannot, select. This is incorrect because it is not grammatically correct to say “we cannot select only the famous ones.”