—Beijing experienced _____ heaviest snowfall in ____ month of January .
Please don’t try to back out _____ everything has been arranged.
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.