A teacher should have the ability to be ____ his or her class.
The game was so exciting to play that the boy kept his eyes and attention ________ on it, ruining both a lot.
The sides of the Iran nuclear negotiation reached a key point, the result of ________ would have a great influence on the world peace.
The astronauts have to lie ________ the floor of the spaceship to fight against the great pressure during the flight.
—________ your new desk-mate?—Well, she is nice except that she talks a little too much.
—I can hardly make myself understood in Chinese. Would you please give me some help?—________. We are trying to help you.