In order to ______ a good knowledge of English, he gave up his job and went to study in an English training center.
Some so-called climate travelers _______ in one place for a few months and then move on to some other places as the weather changes.
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.