There is no doubt ________ only by lifelong learning can we keep up with the advancing society.
Nobody but doctors or nurses and thoseby Dr. Longmanto enter the patient’s room.
—Peter, you take down the result of the experiment, ? —Oh, no problem, but I need to find my pen and notebook first.
To be honest, I wonder why you are so late. —Sorry, I ___ that you were waiting for me.
It is very important for us to employ a word or a phrase according to the in language learning.
It was not until dark ___ he was aware of ___ he thought was the correct way to solve the problem.