Mr Smith is friendly___us ,But he is very strict_____our studies.
The teacher, ____ his book ____ hand, came over to theblackboard.
She gave the students a lesson ____ Mr. Wang.
Let’s go ____ the road. The shop is ____ the other side.
Only four days remained ____ the exam.
Be careful when you go ____ the street because the trafficis very busy at the moment.