______ can be enjoyed from a low-carbon lifestyle until you have a deep understanding of it.
He has promised to _________ the matter and will give the workers a satisfactory answer.
Rather than ________ on a crowded bus , he always prefers ________ a bicycle.
When he came back, his wife was found _________.
Every minute should be made the most of ________ our lessons well.
Our English teacher recommended that we ________ an English dictionary.