As it was almost time for the flight, all the passengers got ______ the plane.
When ________ to danger and conflict, men tend to increase blood pressure, ________ nervous and anxious.
It’s too bad that I failed in the math exam. If only I ______ hard at it!
The last decade of the 21st century ________ the rapid, steady development of China in various fields.
---He should have been warned of the danger. ---_______, but he wouldn’t listen to me.
The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.