______ is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
I _____ in the street when someone _____ me.
The number of people who _______ invited to the meeting _____ fifty, but a number of them _____ absent for different reasons.
The early pioneers had to _____ many difficulties to settle down on the new land.
The teacher called Tim’s mother ________ what he had done in the test.
--You are always full of ________. Can you tell me the secret? --Taking plenty of exercise every day.