单项选择题 Dr Meck wrote: "As is true with most animals, the wolf is an opportunist whilst the deer is one of the shyest ______ animals in existence."

单项选择题 When Pilot Office Peter Thwaites was away on business, his neighbour gave his wife ______ with the housework.

单项选择题 We won't encourage him to do that ______ he is in good health.