The heart is believed to _____blood into veins(血管) which are netted all over the body, thus keeping a person alive.
He gained his _____ by printing _____ of famous writers.
All of ______ sudden someone shouted, “It is time to put ______ end to the meeting.”
It’s important to give the babysitter an emergency phone number ___ the children get hurt or sick.
It was in the school ___ he studied ten years ago ____ he gave a wonderful speech.
—Do you mind if I open the window? ----_____I feel a bit cold.