Right after Vietnam national football team won the AFF Cup 2018, thousands of fans flocked to the streets to celebrate. 

The children had to ______ in the principal's office after they took part in a fight.

I've just been offered a new job! Things are ______. 

Mark the letter A, B, C, or D on your answer sheer to indicate the underlined part that needs correction in each of the following questions

It is necessary and required that dental technicians and others who work with X-rays limit their exposure to these highly penetrating rays

______ Alan for hours but he just doesn't answer his mobile. I hope nothing's wrong. 

My older brother is extremely fond of astronomy, he seems to ______ a lot of pleasure from observing the stars

Most teenagers go through a rebellious ______ for a few years but they soon grow out of it.

In Hawaii it is _______ to greet visitors to the country with a special garland of flowers.