Question

to make concrete stronger, steel is used to ______ it.
1 adorn
2 confirm
3 embrace
4 reinforce

Explanation:

We need to choose the word that fits the context of making concrete stronger with steel. "Adorn" means to decorate, "confirm" means to verify, "embrace" means to hug or accept, and "reinforce" means to strengthen. So "reinforce" is the correct choice as steel is used to strengthen concrete.

Answer:

1. reinforce