下列各句中加横线的成语使用恰当的一项是（ ）

Mike, please be quiet, or the other students hear me clearly.

Let’s go skating after school——_____ Call for me at any time

I always have a small notebook with , and I write down new words.

The project WangLin’s life is one of the many government programmes ________improvingthe situation for the poorest people in China