There are ________ of students in our school, but only ______ are girls.

In China it is a custom to give kids lucky money, _______ during the Spring Festival.

How can I prepare for class, Mr. Johnson?　　　　— __you ____ my web page? You can download the notes and read them ahead of time.

Kangkang, how many apples are there _____ the tree? —Too many. [ ]

Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.