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
The president spoke at the business meeting for nearly an hour without ______ his notes.
E-mail, as well as the telephone, ___________ an important part in daily communication.
-- “____either you or he to go there?” --“_____is.”
Can you imagine what difficulty people had this year ________ against the severe natural disasters?
Many a student ________ failed in the biology exam,and Tom is the only one of them who ________ decided to give up the course.