The traffic rule says that the children ______less than 40 pounds and under the age of four must be in a child safety seat.
The number of people invited ______ fifty, but a number of them ______ absent for different reasons.
He asked, “How are you getting along?” ----He asked ______.
I asked my boss for a month’s holiday and, ______, she agreed.
Rescuers are ______ for the safety of the two men trapped in the mine.
--- How many times have you been to China? --- In fact, it is the first time that I ______ here.