The second book _______ you are reading is written by an American novelist.
After a few courses on painting, Helen said she would ________ oil painting in her spare time.
Most people are familiar with the idea that all matter in the universe ________ atoms.
________, Nathan gave back the enormous amount of money he found.
________ entered the classroom ________ the bell rang.
— Did you remember to give Jenny the money? — Yes. ________ I saw her, I’m sure.