In our class ,when the bell rang and the teacher closed his book ,it was a ________for everyone to stand up .
The news shocked the public, to great concern about students’safey at school.
Can you tell me ___________________? You look upset.
The party supposed to be very boring _____ to be very interesting.
It is demanded that the plan _____ out as soon as possible.
The number of deaths from heart disease will be reduced greatly if people ____ to ear more fruit and vitamins.