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
“Shall Mary come and play computer games?” “No, _______ she has finished her homework.”
The man you referred to _____ just now.
We decided not to climb the mountains because it was raining ________.
He has changed a lot. He _______ not what he _______.
________ cave that George has discovered in his lifetime is near the Alps.