There is a general among teachers about the need for greater security in schools.

The boy doesn’t sing ________ the others, but hedances best of all.

Excuse me, could you tell me ________—There is a bank on the second floor. You can make it there.

Had I made good use of this software, a huge amount of time and energy _________.

They ____ repairing the wall. The _____ wassmooth（顺利）.