_____entering the classroom, remember to take your seat and turn off your cell phone.
Shirley stood in the empty room, ______ so lonely for the first time.
Cheer up! It won’t be ______ we can meet again.
They stood there and ______ each other as if they were going to fight.
The president did much for world peace. That was ______ he was awarded the Nobel Peace Prize.
―Are you disappointed with the result of the experiment? ―No. ______, I’m pleased with it.