They have been waiting for hours to see the singer，but the airplane must have been ________.
A. behind the times B. behind schedule
C. ahead of time D. in no time
It rained heavily in the south，________serious floods in several provinces.
A. caused B. having caused
C. causing D. to cause
The town's water comes from the ________hills.
A. surrounded B. surrounding
C. nearly D. neighbour
He took ________at the beginning of the year.
A. officer B. office
C. official D. officially
Don't leave matches or cigarettes on the table within the ________of little children.
A. hand B. reach
C. space D. distance
Beijing is ________to many key universities.
A. home B. family
C. house D. household
