—You look so worried.What’s the matter?—I don’t know________these boring problems.
Nobody but doctors or nurses and those ________ by Dr Li ________ to enter the patient’s room.
I wish that you ________ such a bad headache because I’m sure that you would have enjoyed the concert.
Calculations,which are astronomically exact,have been made ________ with the use of computers.
What do you think of the suggestion ________ we organize a football club?
—Did you remember the days ________ we studied in the university?—Certainly.Especially the hard times ________ we spent together.