Mr.Morse,who graduated from a famous medical university,spent years ______ his skills as a doctor.
Most of the students have hardly ever been to the Grand Canyon, __ ?
We had an anxious couple of weeks ______ for the results of the experiment.
I don’t think English is a language as Russian.
—I’m sorry. I ______ at you the other day. —Forget it. I was a bit out of control myself.
“Do you have a laptop?” “Yes, I have .”