Expo 2010Shanghai China, a grand-scale global event, has ______ the significant theme“Better City, Better Life”

Yesterday they had a quarrel and broke up with each other，but now they have ______.

Evidence gained from observation and experiment is often used to _______ a scientific theory.

He transplanted the little tree to the garden it was the best time for it.

下列句中，标点符号使用全部正确的一句是（ ）