Tom, clean up the broken glass _________ someone walks on it.
Pictures on TV show the quake-hit capital________to ruins and helpless survivors waiting eagerly for relief.
Having worked as a doctor for so many years, Mr. White has________rich experience in battling with various diseases.
A trip to the forest park is a wonderful________of my happy childhood, when I had no end of fun with my playmates.
I must have been a great_________to my parents in those hard days, for I never failed to live up to their expectations.
I’d like to ___________whether Flight 245 for San Francisco is departing on time .