---Sir, I’m terribly sorry for not having handed in my homework on time, but I have been very busy all these days. ---No excuse for it, but I drop it this time.
—When shall we start? —Let's _____ the time for the trip. What about 8:30? Is that all right?
Don’tspend time beating ona wall, to change it into a door.
One of the most important questions they had to consider was ______ of public health.
You'd better not ring me up between 9 and 10. I________ an important meeting then” Dr. Lee said.
If Joe' s wife goes to the party, _______.