There ______ a number of students in our school. The number of the students ______ more than 7000.

I was born(出生) ________the morning _______February 25,1997

He went home for lunch ____ the clock struck twelve.

Driving Offence Point System is a computer-controlled system _____ to reduce accident rates and make roads much safer.

下列各句中，加点的成语使用恰当的一句是（ ）