There was no news；＿＿＿＿, she did not give up hope. 

After taking part in several rounds of competition, the athlete         won first prize.

You must attend the meeting ____ at ten o’clock, as it is scheduled—not a minute early or late．

The schoolmaster hesitated ___ an instnat before he made the decision.

He began to take political science        only when he left school.