The lack of eco-friendly habits among the public is thought to be a major ____ of global climate change.

.He, out of breath ,_____ himself along the street. Perhaps he was badly ill.

I would rather          history than geography because I can learn a lot from many historical figures.

Mary is really good at taking notes in class. She can _______ almost every word her teacher says.

The beautiful song ________ me of those happy old days we had spent together.