The doctor was busy _________ on the woman at that time.A. operating B. operated C. to operate
Albert Einstein was _______a great scientist.
We were all _______with the _______trip to Dalian.
Every year lots of trees ______to make our country more beautiful.
I’m ______hungry. Could I have something to eat?
-When will your brother return? –I will tell you as soon as he ___back.