根据首字母及汉语提示，完成下列单词的拼写，使句意明确，语言通顺。
【小题1】Be careful with those k________(刀). Don't give them to the baby.
【小题2】Today is her t_________(十二) birthday and she gets many presents.
【小题3】Go s__________(径直) on, and you will see the Palace Museum on your right.
【小题4】Some c________ (学院) students are helping us with our English study.
【小题5】Our school is very big. It has t_________ (千) of students in it.