Glass is made ___ all kinds of bottles.
---_________ ?---I’m not sure, but he might have been ill in bed.
When you study the local map, you'll find this town is .
Out there, in the midst of the snow, ______ in long, black clothes.
The large grassland, reaching out far away, looks extremely beautiful ______ the blue and clean sky.
The teacher wrote an example on the blackboard to ___ the point.