Choose the best sentence: The substance is very toxic. Protective clothing must be worn at all times.

Since + S + V: because

So + S + V: so

So + adj/ adv + be/ V + S that S + V: What’s so… that… (inversion)

…too + adj + to + V_infinitive: …too… so much that it can’t be done

A. Because the substances are very toxic, protective clothing must be worn at all times. => wrong grammar because using 2 conjunctions in the same sentence

B. The substances are so toxic that protective gear must be worn at all times.

C. Grammatical error because after “such” is a noun or noun phrase, and “toxic” is an adjective: poisonous, poisonous

D. Substances are so toxic that protective gear cannot be worn at all times. => wrong meaning

The substances are very toxic. Protective gear must be worn at all times.

= The substances are so toxic that protective gear must be worn at all times.

Select REMOVE