That hazy(雾霾)weather has hit 104 cities in middle-east China lately makes citizens well aware of ______a terrible problem China is faced with.
You __________be tired—you’ve only been working for an hour.
Walking around, I found the city was full of people__________ for the festival.
We hadn’t planned to meet. We met ________ chance.
-----How do you like the plan? ------______.
We should try our best to ______ those people after the disaster.