The lecture was so complex that I simply couldn’t ______ at all. Could you explain it to me

Tom told us all that he said at the meeting was really true

It is thetest system, ______ the teachers,that is to blame for the heavy burden ofmiddle school students nowadays.

The boy hoton the forehead. He must be sent to the hospital at once.

_______ people died ______ starvationthat year will never happen.