An air crash accident happened to the plane, ______.
I am fond of my sister but she has one serious shortcoming. She _______ be really impatient.
---Can I smoke here?---Sorry. We don’t allow _______ here.
Only by increasing the number of doctors by 50 percent _______ properly in this hospital.
--- So you didn’t say hello to Miss Wang last night?--- Well, I stopped and smiled when I saw her, but she _______ me and walked on.
Although _______ to be the best in a recent science competition, the student remains modest.