根据句意，在答卷标有题号的横线上，写出括号内所给单词的适当形式。

小题1:They are planning when and where to celebrate his grandfather’s _____(ninety) birthday.

小题2:‘Nanjing! Nanjing!’ is a film full of _____(sad). All of us felt depressed after seeing it.

小题3:The weather in the north is much _________(dry) than that in the south.

小题4:The world _______(it) is changing all the time.

因其一次安置仪器就可完成该测站上（）测量工作，所以称之为全站仪。

A.距离

B.斜角

C.高差

D.全部