As is known to us, theory is based on practice and servers practice. A. by chance B. in turn C. in return C. by turn
——How is it that you are late for class again? ——________.
The accident ______ for a new car. Because the old one was destroyed.
The two brothers carried a ______ bed into the room.
It is difficult for you to ______ what will happen in space without gravity.
The ______ in the mountain village struck most of the visitors.