下列句子中，划线的成语使用正确的一项是（　　）

(2012·九江高二检测) The aim of the project is to encourage students to _______ new ideas on networks

I thinknecessary to do some running in the morning.

The number of the peoplewhocarsincreasing.

I’m expecting for long to have a drone(无人机)to take photos, but my parents refuse to buy _______for me.