. The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them.
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.