Haze (雾霾)appears around us. Let’s do ________ helpful to protect the environment.
---What do you do after school?---I practice_________ the guitar.
It takes ___ thirty minutes to get to school by bike.
He always goes to work on time. He is _______ late.
---Can you join us for dinner tonight ? --- Sorry, I’m afraid not. I _______ look after my sister.
He likes reading and __________.