Question

How can sentence 1 best be written?

(1) Penicillin, one of our most important drugs, come from mold.

A.
One of our most important drugs, penicillin come from mold.

B.
One of our most important drugs, mold, comes from penicillin.

C.
Penicillin, one of our most important drugs, comes from mold.

D.
Penicillin, one of our most important drugs, coming from mold.

Answer 1

The best way to write the sentence is 'Penicillin, one of our most important drugs, comes from mold.' It uses correct subject-verb agreement and emphasizes penicillin's significance as a drug.

Step-by-step explanation:

The correct way to write sentence 1 is: Penicillin, one of our most important drugs, comes from mold. This sentence is option C. The subject of the sentence is 'Penicillin,' which is singular, so the verb that goes with it should also be singular ('comes') to agree with the subject in number. The sentence as it stands in option C correctly indicates that penicillin is derived from mold and also emphasizes its importance as a drug.

Answer 2

C. Penicillin, one of our most important drugs, comes from mold.

Step-by-step explanation:

A is wrong because the verb is in an incorrect form. The noun here 'penicillin' is singular, so the verb should be plural (or present tense, as comes) to agree with the noun.

B is wrong because the drug here is penicillin, but the sentence structure and comma placement make it seems as though the drug is 'mold', which comes from penicillin.

D is wrong because the verb here is in present continuous tense, coming, which disagrees with the statement.

C is right because the verb tense is present, and plural, comes, and agrees with the statement.