She made one or two remarks which suggested that the company _____in financial trouble.

Cathy went to the hospital alone. If she had told me about it, I       with her.

--- Has James finished his report on his Enquiry Learning yet?\ ---- I’m not sure. He _____ on it last week.

The way of life he was used to _______ when he came to study in America. 

While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.