An automatic driving assistant can be ____ in certain situations. (USE) Use the word in bracket to form a word that fits in the gapa.useb.usedc.useful

The correct answer to fill in the blank is "useful."

Explanation

In the sentence provided, the word "useful" is an adjective that describes the automatic driving assistant. The context indicates that the assistant is beneficial or advantageous in certain situations. The other options provided do not fit grammatically or contextually:

1. "useb" is not a valid word.
2. "used" is the past tense of "use," which doesn’t fit with the present and ongoing context of the sentence.
3. "useful" appropriately conveys that the automatic driving assistant serves a purpose or adds value in specific circumstances.

Thus, the sentence reads: "An automatic driving assistant can be useful in certain situations."