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
Is _____ possible to fly to the moon in a spaceship?
You can’t _____ until tomorrow morning after the blood examination.
We’re trying our best to get our English _____.
Though some foreign scientists had a ______ opinion of his new invention, his fellow workers never thought ____ of it.
_____ people who buy IBM PC686 is larger than ever before.