Could you join us this afternoon—Sorry, I_______. I take care of my little sister because my mother is out.

vernment officials met the workers and engineersworking on the stadium, most _________ being migrant workers.

Instructions for homework have to be ____ so that every student knows clearly what is to do after class.[ ]

You see, I’m poor in maths, you are not good at English, and…-That’s ________we should help each other[ ]

In winter, we must pay attention to .