다음 문장의 괄호 안에서 맞는 표현을 골라야 하는데 잘 모르겠어요.
1. Organisms get the energy they (use to carry out / are used to carrying out) their life processes from the chemicals in food.
2. The overuse of salt causes high blood pressure, which leads to salt (banning / being banned) from baby food.
3. Scientists agree that “exposing” to a wide range of allergens early in life helps children to develop greater immunity.
1번과 2번 정답이 무엇인지, 3번의 “exposing”은 맞는 표현인지 알려주세요.