I didn’t quite follow him because he explained the theory _____that is too abstract for me.
__________along the quiet road at forty miles an hour,and then an old man suddenly started to cross the road in front of me.
The policeman came up to the lonely house with the door __________,__________there for a while and then entered it.
The boy often gives a satisfactory answer to the teacher’s question,__________ just a minute.So he’s usually the teacher’s pet.
A doctor can expect__________at any hour of the day or night.
We found the students seated at tables and had their eyes__________on the scene of the launch of Shenzhou V spaceship.