No one knows exactly when our ancestors started talking, but new evidence suggests that____ might have happened a long time ago.
—A number of people ________ learning English nowadays. —Yes. The number of people who are learning English ________ increasing.
Our manager is so ________that she won't change her mind, so we have to change our plan.
I said hello to you in the street yesterday, but you ________ me completely. —I'm sorry. Maybe I didn't notice you.
petrol
concern