The little boy was found in his room the next day.
Simon is very regretful. If he had been more careful, he _____ such a big mistake.
______ by jeep, we visited a number of cities in South China.
Zheng He had over 300 ships, _______ some were over 150 meters long and could carry up to 1,000 people.
______ the dangerous situation, he was not nervous but handled it in a clever way.
Having cycled for two days, Howard at last arrived at ______ was a place famous for its beautiful scenery.